问题标题:
7年级三道计算题求解决求过程求帮助谢谢大家了~~1.x+2(x-1)-3(x+2)2.6a²-2ab-2(3a²+ab)3.5ab²-[2a²b-2(a²b-2ab²)]
问题描述:
7年级三道计算题求解决求过程求帮助谢谢大家了~~
1.x+2(x-1)-3(x+2)
2.6a²-2ab-2(3a²+ab)
3.5ab²-[2a²b-2(a²b-2ab²)]
黄一川回答:
1.x+2(x-1)-3(x+2)=x+2x-2-3x-6=-82.6a²-2ab-2(3a²+ab)=6a²-2ab-6a²-2ab=03.5ab²-[2a²b-2(a²b-2ab²)]=5ab²-[2a²b-2a²b+4ab²]=5ab²-2a²b+2...
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