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【320965】五年级数学下册典型例题系列之第四单元约分和通分专项练习(解析版)人教版

时间:2025-01-08 19:03:29 作者: 字数:14082字
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 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 2021-2022学年五年级数学下册典型例题系列之

第四单元约分和通分专项练习(解析版)

1.把下面的分数化成最简分数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                      <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

找出分子和分母的最大公因数,然后分子、分母同时除以它们的最大公因数,得到最简分数。

【详解】

414的最大公因数是2

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

1025的最大公因数是5

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

1824的最大公因数是6

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

2.把下面各数先约分再化成整数或带分数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 4 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

把一个分数化成和它相等,但分子和分母都比较小的分数,叫做约分。运用分数的基本性质进行约分,分子和分母同时除以它们的最大公因数。把假分数化成带分数的方法:用分子除以分母,得到的商和余数;商是带分数的整数部分,余数是带分数的分子,分母不变。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3.把下面的分数约分,是假分数的要化成带分数或整数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =                      <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =                    <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 5

【解析】

【分析】

首先根据约分的方法,把下面各分数进行约分,再根据假分数化成带分数的方法:把假分数化成带分数,用分子除以分母得到的商作整数部分,余数作分子,分母不变,能整除的可以化成整数;据此解答。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                      

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                   

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4.把下面的分数化成最简分数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>         <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>       <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>      

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

根据分数的基本性质,用分子分母同时除以它们的最大公因数即可。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

5.约分。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =                <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

根据分数的基本性质,把分子、分母同时除以一个相同的数(0除外),约成分母更小,分数大小不变的最简分数;分子和分母只有公因数1的分数是最简分数。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

6.把下面的分数约分成最简分数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                         <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                         <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

约分的方法:用分子、分母的公因数(或最大公因数)分别去除分子和分母,直到分子、分母是互质数,即直到得到最简分数为止。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 2                <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

7.把下列分数化为最简分数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

利用分解质因数的方法找到分子和分母的最大公因数,再进行约分,把分子和分母同时除以它们的最大公因数,约分成分子和分母只有公因数1,就是最简分数。

【详解】

1153×5

355×7

1535的最大公因数是5,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

2162×2×2×2

567×2×2×2

1656的最大公因数是8,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3505×5×2

755×5×3

5075的最大公因数是25,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

43417×2

1022×17×3

34102的最大公因数是34,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

5482×3×2×2×2

202×2×5

4820的最大公因数是4,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

68127的倍数,较小数是它们的最大公因数,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 3

712111的倍数,较小数是它们的最大公因数,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

89519的倍数,较小数是它们的最大公因数,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

8.把下面的各分数约分。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> =              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

约分的方法:用分子、分母的公因数(或最大公因数)分别去除分子和分母,直到分子分母是互质数即直到得到最简分数为止。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

9.把下面各分数约分,是假分数的要化为带分数或整数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>          <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

约分的方法:用分子、分母的公因数(或最大公因数)分别去除分子和分母,直到分子分母是互质数即直到得到最简分数为止。

假分数化带分数,用分子除以分母。当分子是分母的整数倍时,能化成整数,商就是这个整数。当分子不是分母的整数倍时,能化成带分数,商是带分数的整数部分,余数是分数部分的分子,分母不变。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

10.能约分的先约分,再把假分数化成带分数或整数。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> 3  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

可以先找分子和分母的最大公因数,约分成最简分数,或整数;假分数化带分数,用分子除以分母,商作整数部分,余数作分数部分的分子,分母不变。

【详解】

1510的最大公因数是5

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


186的最大公因数是6

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


1612的最大公因数是4

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

7920的最大公因数是1,互质

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

11.先通分,再比较大小。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

根据分数的基本性质:分数的分子和分母同时乘或除以一个相同的数(0除外),分数的大小不变,据此解答。

【详解】

1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

因为 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

因为 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

因为 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

4 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

因为 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

12.把下面每组中的两个分数通分。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                             <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                             <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】(1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

先找两个分母的最小公倍数,再利用分数的基本性质,进行通分即可。

【详解】

1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

13.先通分,再比较大小。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                                   <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

本题根据分数的基本性质将各组分数化成同分母分数后比较大小即可。

【详解】

1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

因为: <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

所以: <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

因为: <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

所以: <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

14.比较下列分数的大小。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

这四题都是异分母分数的大小比较,先找出分母的最小公倍数再通分,把它们化成同分母分数,再进行大小比较即可。

【详解】

1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

4 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,即 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

15.通分并比较大小。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>              <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】见详解

【解析】

【分析】

通分的方法:先求出两个分数的分母的最小公倍数,把它作为这几个分数的公分母,然后依据分数的基本性质,把原分数分别化成以公分母为分母的分数;通分后依据同分母分数大小的比较方法比较。

【详解】

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 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

16.将下面各组分数通分。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

先找出两个分母的最小公倍数,然后进行通分。

【详解】

86的最小公倍数是24

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


248的最小公倍数是24

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


127的最小公倍数是84

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>


 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

17.通分。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>               <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

通分的方法:先求出几个分数的分母的最小公倍数,把它作为这几个分数的公分母,然后依据分数的基本性质,把原分数分别化成以公分母为分母的分数。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

18.先约分,再比较大小。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>            <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】见详解

【解析】

【分析】

根据分数的基本性质约分后比较大小即可。分数的基本性质:分数的分子与分母同时乘或除以相同的数(0除外),分数的大小不变。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

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19.用自己的方法比较每组中两个分数的大小。

1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>        (2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>      (4 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】(1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ;(2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ;(4 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【解析】

【分析】

分子分母都不相同的分数的大小比较:

1)将比较的几个分数通分,使分母相等,再根据分子的大小来比较。

2)将各个分数的分子转化为相同的数,根据分子相同分母小的反而大进行比较。

【详解】

1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

2 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

3 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

4 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

20.先通分,再比较每组中分数的大小。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                      <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>                      <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【答案】答案见解析

【解析】

【分析】

通分要根据分数的基本性质,分数的分子和分母同时扩大或缩小相同的倍数(0除外),分数大小不变;分母相同时,分子越大,分数越大。

【详解】

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ;                    

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ;所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a> ,所以 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/96/" title="典型" class="c1" target="_blank">典型</a> <a href="/tags/97/" title="系列" class="c1" target="_blank">系列</a> <a href="/tags/98/" title="例题" class="c1" target="_blank">例题</a>

【点睛】

此题考查分数大小比较的方法,注意理解并灵活运用分数的大小比较的方法,解决实际中的一些问题。






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