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x方-5x+6/x方-1/x-3/x方+x*x+2/x+1 怎么填?
人气:286 ℃ 时间:2019-12-17 16:48:00
解答
原式=(x-2)(x-3)/(x+1)(x-1)*x(x+1)/(x-3)*(x+2)/(x+1)
=(x-2)/(x-1)*x*(x+2)/(x+1)
=(x³-4x)/(x²-1)
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