高考问答房价还在疯长:Is the inequality A + B ≤ 7 equivalent to
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a.-A - B ≤ 7
b.-A - B ≥ 7
c.-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
Is the inequality A + B ≤ 7 equivalent to
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