分式约分x/x^2y-y÷x^2y/x^2+x.(xy-x^2)乘xy/x-y
问题描述:
分式约分x/x^2y-y÷x^2y/x^2+x.(xy-x^2)乘xy/x-y
答
x/x^2y-y÷x^2y/x^2+x
=(x-y)/(x²y)×(x²+x)
=(x-y)(x+1)/(xy);
(xy-x^2)乘xy/x-y
=x(y-x)xy/(x-y)
=-x²y;
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