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问题: 初二数学

(x+2 / x^2-4x+4)-(1 / 2x+4)-(x-1 / 2x^2-8)

解答:

解:原式=(x+2)/(x-2)^2-1/2(x+2)-(x-1)/2(x+2)(x-2)
=[2(x+2)^2-(x-2)^2-(x-1)(x-2)]/2(x-2)(x+2)
=(2x^2+8x+8-x^2+4x-4-x^2+3x-2)/2(x-2)(x+2)
=(15x+2)/2(x-2)(x+2)