一道分式的乘除法求当x=-4时,式子（4-4x+x - 知识问答

一道分式的乘除法求当x=-4时,式子（4-4x+x^2）分之（2x^2-18）÷[(x+3)·(x^2+x-6)分之(3

1个回答

原式=[2(x+3)(x-3)/(x-2)²]÷[-(x-3)(x+3)/(x+3)(x-2)]
=-[2(x+3)(x-3)/(x-2)²]×[(x-2)/(x-3)]
=-[2(x+3)(x-3)(x-2)/[(x-2)²(x-3)]
=-2(x+3)/(x-2)
=-2*(-1)/(-6)
=-1/3

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