(x^2-xy)y÷y-x/xy怎么做?
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(x^2-xy)y÷y-x/xy怎么做?
(x^2-xy)y÷y-x/xy怎么做?
(x^2-xy)y÷y-x/xy怎么做?
=xy(x-y)×[-xy/(x-y)]
=-(xy)²
=-x²y²
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