2009年酒瓶门迅雷种子:Is the inequality A + B ≤ 7 equivalent to

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a.-A - B ≤ 7

b.-A - B ≥ 7

c.-A - B ≤ - 7

在初中的绝对等式有这样公式 （我用中括号代替绝对号）：

A+B ≤ 7 全等于 -[A+B]≥-[7]

将括号去除得， -A-B ≥ -7

不过答案里面怎么没有这个选项？？？

应该选择 -A-B≥ -7才对

没有答案

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