先化简再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=1/2,b=-1
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先化简再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=1/2,b=-1
先化简再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=1/2,b=-1
先化简再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=1/2,b=-1
(a²b-2ab²-b³)÷b-(a+b)(a-b),
=a²-2ab-b²-(a²-b²)
=-2ab-2b²
=-2b(a+b)
=-2×(-1)×(1/2-1)
=-1