作业帮计算： (2a²+3a-1)-4(a²-a+1) 先化简,再求值： 5ab-2[3ab-(4ab²计算：(2a²+3a-1)-4(a²-a+1)先化简,再求值：5ab-2[3ab-(4ab²+1/2ab)]-5ab²,其中a=1/2,b=-2/3
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![计算： (2a²+3a-1)-4(a²-a+1) 先化简,再求值： 5ab-2[3ab-(4ab²计算：(2a²+3a-1)-4(a²-a+1)先化简,再求值：5ab-2[3ab-(4ab²+1/2ab)]-5ab²,其中a=1/2,b=-2/3](/uploads/image/z/1333413-45-3.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A+%282a%26%23178%3B%2B3a-1%29-4%28a%26%23178%3B-a%2B1%29+%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A+5ab-2%5B3ab-%284ab%26%23178%3B%E8%AE%A1%E7%AE%97%EF%BC%9A%282a%26%23178%3B%2B3a-1%29-4%28a%26%23178%3B-a%2B1%29%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A5ab-2%5B3ab-%284ab%26%23178%3B%2B1%2F2ab%29%5D-5ab%26%23178%3B%2C%E5%85%B6%E4%B8%ADa%3D1%2F2%2Cb%3D-2%2F3)
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计算： (2a²+3a-1)-4(a²-a+1) 先化简,再求值： 5ab-2[3ab-(4ab²计算：(2a²+3a-1)-4(a²-a+1)先化简,再求值：5ab-2[3ab-(4ab²+1/2ab)]-5ab²,其中a=1/2,b=-2/3
计算： (2a²+3a-1)-4(a²-a+1) 先化简,再求值： 5ab-2[3ab-(4ab²
计算：
(2a²+3a-1)-4(a²-a+1)
先化简,再求值：
5ab-2[3ab-(4ab²+1/2ab)]-5ab²,其中a=1/2,b=-2/3
计算： (2a²+3a-1)-4(a²-a+1) 先化简,再求值： 5ab-2[3ab-(4ab²计算：(2a²+3a-1)-4(a²-a+1)先化简,再求值：5ab-2[3ab-(4ab²+1/2ab)]-5ab²,其中a=1/2,b=-2/3
