两道分式计算题..........................................................

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两道分式计算题..........................................................
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两道分式计算题..........................................................
两道分式计算题
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两道分式计算题..........................................................
题呢?

2.=(x 4)(x-4)/(x 4) 2; x/(x-4) =(x-4)/(x 4) x/(x-4)=(公分母:(x 4)(x-4)) =【(x-4) 2; x(x 4)

等于3/x^2+4x+3
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