已知a的绝对值=3,a-b的绝对值=0,且ab<0,求3a+2b的值;ab的值
人气:221 ℃ 时间:2019-11-12 07:36:20
解答
a-|b|=0,所以a=|b|≥0
|a|=3,所以a=3
ab<0,所以b<0
又a=|b|,所以b=-3
3a+2b=3*3+2*(-3)=3
ab=3*(-3)=-9
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