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数学
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a*b=3a-2b,则(5*4)*2等于
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人气：423 ℃ 时间：2020-04-06 01:29:23
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a+2b+3c=5 3a+2b+c=-4则a+b+c等于?
已知a+2b=4和3a+2b=8.则a+b等于_____.
2b/3a=a/2b a+2b=3 则a和b分别等于
3a-2b=2 a和b各等于多少~
若1＜a+b＜5，-1＜a-b＜3，求3a-2b的取值范围．
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化简[(ab+1)(ab-1)-2a^2b^2+1]/ab
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