第一个和第二个通分分母为:(x+2)(x-2)² 第三四五个通分分母为:6x(x-2)(x+3)² 分子代入算就是了.
1/(2-x)²,x/x²-4 1/3x(x-2),1/(x-2)(x+3),1/2(x+3)
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