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五年级速算技巧
更新时间: 2021-02-23 12:24:02  

1、基准数法。

先观察各个加数的大小接近什么数字,再把每个加数先按接近的数字相加,然后再把少算的加上,把多算的减去。

2、“凑整”先计算法。

两个数相加,若能恰好凑成整十、整百、整千、整万…则先计算。

3、等差数列法。

计算等差连续数(等差数列)的和相邻的两个数的差都相等的一串数就叫等差连续数,又叫等差数列。

关键词: 年级 技巧

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