【xy-x²】*xy/x-y

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【xy-x²】*xy/x-y
x){0RBMqDJ J"}rv6uXLk Th5` [hP~.m*.H̳Y9}

【xy-x²】*xy/x-y
【xy-x²】*xy/x-y

【xy-x²】*xy/x-y

(xy-x²)xy/(x-y)
=x²y(y-x)/[-(y-x)]
=-x²y