先化简,再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=-1
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![先化简,再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=-1](/uploads/image/z/1672862-14-2.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88a%26%23178%3Bb-2ab%26%23178%3B-b%26%23179%3B%EF%BC%89%C3%B7b-%EF%BC%88a%2Bb%29%28a-b%29%2C%E5%85%B6%E4%B8%ADa%3D-1)
先化简,再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=-1
先化简,再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=-1
先化简,再求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=-1
(a²b-2ab²-b³)÷b-(a+b)(a-b)
=a²-2ab-b²-(a²-b²)
=a²-2ab-b²-a²+b²
=-2ab
=-2×(-1)b
=2b