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【330007】15.1.2分式的基本性质(3)

时间:2025-02-07 09:17:13 作者: 字数:1745字

 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

15.1.2分式的基本性质(3

学习目标

1、了解分式通分的步骤和依据。

2、掌握分式通分的方法。

3、通过思考、探讨等活动,发展学生实践能力和合作意识。

学习重点:分式的通分。

学习难点:准确找出不同分母的分式的最简公分母。

课前预习

1、分式的基本性质的内容是 用式子表示

2、计算: <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ,运算中应用了什么方法?这个方法的依据是什么?

4、猜想:利用分式的基本性质能对不同分母的分式进行通分吗?

自主探究:p131的“思考”。

归纳:分式的通分:

二、学教互动:

1p7的“例4”

最简公分母:

通分的关键是准确找出各分式的

2、分式 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的最简公分母( )

A、(x-12 B、(x-13 C、(x-1D、(x-121-x3

3、求分式 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的最简公分母 ,并通分。





P132的“练习”的2

课内探究

1、通分:(1 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 、 (2 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 、(3 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>



2、通分:(1 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>2 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>3 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>







当堂检测

1、 分式 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的最简公分母是( )

. <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  B. <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  C. <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  D. <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>

1、分式 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 的最简公分母是( ).

A24a2b3 (B)24ab2 (C)12ab2 (D)12a2b3

2、通分

1 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ; (2 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> .




课后训练

通分:

1 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 2 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>



3 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> 4 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>  <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>



5 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> ; (6 <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a> <a href="/tags/253/" title="基本" class="c1" target="_blank">基本</a> <a href="/tags/386/" title="性质" class="c1" target="_blank">性质</a> <a href="/tags/846/" title="分式" class="c1" target="_blank">分式</a>