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试比较ab与a的大小
更新时间: 2020-09-17 00:00:00  

这属于分类讨论的题型:

解:将原式变形为(a+b)-a=b;

1、当b大于0时,a+b大于a;

2、当b等于0时,a+b等于a;

3、当b小于0时,a+b小于a。

关键词: 比较 ab 大小

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