2x²(x²-1/2x+1)-x(2x³-x³+3x-1),其中x=-1/2(2)3x-(x²-2x+1-2x²(x-3) (-1/2ab)(2/3ab²-2ab+4/3b+1)(-1/2ab)(2/3ab²-2ab+4/3b+1) 是第三题
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![2x²(x²-1/2x+1)-x(2x³-x³+3x-1),其中x=-1/2(2)3x-(x²-2x+1-2x²(x-3) (-1/2ab)(2/3ab²-2ab+4/3b+1)(-1/2ab)(2/3ab²-2ab+4/3b+1) 是第三题](/uploads/image/z/995002-34-2.jpg?t=2x%26%23178%3B%EF%BC%88x%26%23178%3B-1%2F2x%2B1%EF%BC%89-x%EF%BC%882x%26%23179%3B-x%26%23179%3B%2B3x-1%EF%BC%89%2C%E5%85%B6%E4%B8%ADx%3D-1%2F2%EF%BC%882%EF%BC%893x-%EF%BC%88x%26%23178%3B-2x%2B1-2x%26%23178%3B%EF%BC%88x-3%EF%BC%89+%EF%BC%88-1%2F2ab%EF%BC%89%EF%BC%882%2F3ab%26%23178%3B-2ab%2B4%2F3b%2B1%EF%BC%89%EF%BC%88-1%2F2ab%EF%BC%89%EF%BC%882%2F3ab%26%23178%3B-2ab%2B4%2F3b%2B1%EF%BC%89+%E6%98%AF%E7%AC%AC%E4%B8%89%E9%A2%98)
2x²(x²-1/2x+1)-x(2x³-x³+3x-1),其中x=-1/2(2)3x-(x²-2x+1-2x²(x-3) (-1/2ab)(2/3ab²-2ab+4/3b+1)(-1/2ab)(2/3ab²-2ab+4/3b+1) 是第三题
2x²(x²-1/2x+1)-x(2x³-x³+3x-1),其中x=-1/2
(2)3x-(x²-2x+1-2x²(x-3) (-1/2ab)(2/3ab²-2ab+4/3b+1)
(-1/2ab)(2/3ab²-2ab+4/3b+1) 是第三题
2x²(x²-1/2x+1)-x(2x³-x³+3x-1),其中x=-1/2(2)3x-(x²-2x+1-2x²(x-3) (-1/2ab)(2/3ab²-2ab+4/3b+1)(-1/2ab)(2/3ab²-2ab+4/3b+1) 是第三题
此类问题的通解是
先化简,再求值.先按乘法分配率去掉括号,再按降幂逐项合并,最后代入数值求解.