字典翻译 问答 小学 数学 有理数a、b在数轴上位置如图所示,试化简|a-b|-|a+b|+2|b-2a|··········································b0a
问题标题:
有理数a、b在数轴上位置如图所示,试化简|a-b|-|a+b|+2|b-2a|··········································b0a
问题描述:

有理数a、b在数轴上位置如图所示,试化简|a-b|-|a+b|+2|b-2a|

··········································

b0a

洪锦伟回答:
  a>0>b   故a-b>0   b-2a
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