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【319498】【详解】三年级(上)第20讲 等差数列初步

时间:2025-01-07 22:54:16 作者: 字数:1573字
简介:
试题简介

本试卷主要围绕“等差数列初步”展开,考察范围包括等差数列的基本概念、通项公式、求和公式以及实际应用。试题难度适中,例题和练习题多为基础题,旨在巩固学生对等差数列的理解和应用能力。亮点在于结合生活场景和实际问题,如砖块排列、周期数列等,增强试题的趣味性和实用性,同时通过多样化的题型,培养学生的逻辑思维和解决问题能力。

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第二十讲 等差数列初步

  1. 例题1
    答案:(157;(29
    详解:如下图:
    Shape1

  2. 例题2
    答案:1622188
    详解:如下图:
    Shape2

  3. 例题3
    答案:(16;(29
    详解:如下:
    Shape3

  4. 例题4
    答案:(112;(213
    详解:如下:
    Shape4

  5. 例题5
    答案:2138915
    详解:如下图:
    Shape5

  6. 例题6
    答案: <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>
    详解:可能是 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> ,则等差数列中可能是979695,排除96,若为95,应是等差数列135……中的第48项,对应的周期数列123123、……第48个数为3 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> 等于98,所以这个算式 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> .若为97,也满足,是 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

  7. 练习1
    答案:30
    简答:如下图:
    Shape6

  8. 练习2
    答案:100
    简答:如下图:
    Shape7

  9. 练习3
    答案:6
    简答:如下:

    总差: <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

    公差数: <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> (个)

    公差: <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

     

  10. 练习4
    答案:102
    简答:项数= <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

  11. 作业1
    答案:57
    简答:公差为2,首项与末项相差 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> 个公差,首项为 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

  12. 作业2
    答案:93
    简答:首项与末项相差 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> 个公差,首项为 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

  13. 作业3
    答案:251
    简答:第9项与首项相差 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> 个公差,公差为 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> .第20项为 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

  14. 作业4
    答案:49
    简答:第15项与第5项相差10个公差,公差为 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a> <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>63与第5项差4个公差,所以是第9项.

  15. 作业5
    答案:73
    简答:每层的砖数构成一个等差数列,首项是1,公差是4.第19项为 <a href="/tags/29/" title="初步" class="c1" target="_blank">初步</a> <a href="/tags/221/" title="等差数列" class="c1" target="_blank">等差数列</a> <a href="/tags/162/" title="数列" class="c1" target="_blank">数列</a>

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