先化简,再求值:2(3a²b-ab²)-4a²b+5-3(3分之2a²b-ab²+4),其中a=2,b=2分之1
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![先化简,再求值:2(3a²b-ab²)-4a²b+5-3(3分之2a²b-ab²+4),其中a=2,b=2分之1](/uploads/image/z/445261-13-1.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A2%283a%26%23178%3Bb-ab%26%23178%3B%29-4a%26%23178%3Bb%2B5-3%283%E5%88%86%E4%B9%8B2a%26%23178%3Bb-ab%26%23178%3B%2B4%29%2C%E5%85%B6%E4%B8%ADa%3D2%2Cb%3D2%E5%88%86%E4%B9%8B1)
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先化简,再求值:2(3a²b-ab²)-4a²b+5-3(3分之2a²b-ab²+4),其中a=2,b=2分之1
先化简,再求值:2(3a²b-ab²)-4a²b+5-3(3分之2a²b-ab²+4),其中a=2,b=2分之1
先化简,再求值:2(3a²b-ab²)-4a²b+5-3(3分之2a²b-ab²+4),其中a=2,b=2分之1
2(3a²b-ab²)-4a²b+5-3(3分之2a²b-ab²+4)
=6a²b-2ab²-4a²b+5-2a²b+3ab²-12
=ab²-7
a=2,b=1/2
=2*(1/2)²-7
=-6又1/2