(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=2分之1,b=-1
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![(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=2分之1,b=-1](/uploads/image/z/4115002-58-2.jpg?t=%EF%BC%88a%26%23178%3Bb-2ab%26%23178%3B-b%26%23179%3B%EF%BC%89%C3%B7b-%EF%BC%88a%2Bb%EF%BC%89%EF%BC%88a-b%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D2%E5%88%86%E4%B9%8B1%2Cb%3D-1)
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(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=2分之1,b=-1
(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=2分之1,b=-1
(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=2分之1,b=-1
(a²b-2ab²-b³)÷b-(a+b)(a-b)
=b(a²-2ab-b²)÷b-(a²-b²)
=a²-2ab-b²-a²+b²
=-2ab
将a=2分之1,b=-1代入,原式=1