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【321402】【详解】6年级_下册_第03讲 分数计算综合提高

时间:2025-01-08 19:51:14 作者: 字数:2064字
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第三讲 分数计算综合提高


  1. 答案:1111 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> 2475
    解答:1)凑整;(2)约分;(3)平方差公式后约分;(4)找规律计算,括号展开后分别计算同分母分数,会发现等差数列.

  2. 答案:3161
    解答:1 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

2 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

3 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

4设: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

  1. 答案:4448773
    解答:首先,不考虑: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> 这五个分数,剩下的分数转化为循环小数: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> ,所以第2013位数字是4,注意到 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> 会影响到小数点后第3位,所以循环节是877344

  2. 答案: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
    解答:1 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
    2 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
    3 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
    4 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

  3. 答案:1 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
    解答:
    1 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> A=1
    2 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

  4. 答案:39391949
    解答:观察图表可发现第一列分数的分母都是1,第2列分数的分母都是2,第3列分数的分母都是3,第4列分数的分母都是4,……,第1949列分数的分母都是1949,且第1949列、第1949行的分数是 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> ,所以第1949列,3939行得到的是 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

练习:

练习1答案:95.简答:分母是234、……,的分数之和依次是0.511.5、……,这样一个的等差数列,所以,和是 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

练习2答案: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
简答:(1 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> ;(2 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> ,……, <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
练习3答案:5
简答: 小数点后第2012位只与 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> 有关,而 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> 2,所以,2012位是5
练习4答案: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>  <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
简答:(1 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>
2 <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

作业

  1. 答案:22.5.简答:
     <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

  2. 答案:第666位、2013位数字分别是08.简答:同例3的算法.

  3. 答案: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> .简答:
     <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

  4. 答案: <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a> .简答::
     <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/248/" title="提高" class="c1" target="_blank">提高</a> <a href="/tags/279/" title="综合" class="c1" target="_blank">综合</a>

  5. 答案:394272.简答:.按从右上到左下斜线计算,发现分母是23456……的分数之和依次是0.511.52、……,接下来按等差数列即可得出394272

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