先化简再求值:5(3a²b-ab²)-(ab²+3a²b)其中a=二分之一,b等于负1
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![先化简再求值:5(3a²b-ab²)-(ab²+3a²b)其中a=二分之一,b等于负1](/uploads/image/z/1604513-65-3.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%3A5%283a%26%23178%3Bb-ab%26%23178%3B%29-%28ab%26%23178%3B%2B3a%26%23178%3Bb%29%E5%85%B6%E4%B8%ADa%3D%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%2Cb%E7%AD%89%E4%BA%8E%E8%B4%9F1)
先化简再求值:5(3a²b-ab²)-(ab²+3a²b)其中a=二分之一,b等于负1
先化简再求值:5(3a²b-ab²)-(ab²+3a²b)其中a=二分之一,b等于负1
先化简再求值:5(3a²b-ab²)-(ab²+3a²b)其中a=二分之一,b等于负1
5(3a²b-ab²)-(ab²+3a²b)
=15a²b-5ab²-ab²-3a²b
=12a²b-6ab²
当a=二分之一,b等于负1时
原式=12×1/4×(-1)-6×1/2×1
=-3-3
=-6