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数学
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5ab²-6[3/2a²b-2/3(4a²b+2ab²)]其中a=1,b=-1
人气:436 ℃ 时间:2020-05-28 09:23:56
解答
5ab²-6[3/2a²b-2/3(4a²b+2ab²)]=5ab²-9a²b+4(4a²b+2ab²)=5ab²-9a²b+16a²b+8ab²=13ab²+7a²b=13-7=6
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