化简并求值2(a²b+ab²)-2(a²b-1)-2ab²-2,其中a=-2,b=2
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化简并求值2(a²b+ab²)-2(a²b-1)-2ab²-2,其中a=-2,b=2
化简并求值2(a²b+ab²)-2(a²b-1)-2ab²-2,其中a=-2,b=2
化简并求值2(a²b+ab²)-2(a²b-1)-2ab²-2,其中a=-2,b=2
2(a²b+ab²)-2(a²b-1)-2ab²-2=2a²b+2ab²-2a²b+2-2ab²-2=0 与a,b的取值无关.
有这个心想打上来都可以做出来了
2(a²b+ab²)-2(a²b-1)-2ab²-2
=2a²b+2ab²-2a²b+2-2ab²-2
=0
弧长除以半径