xy×(xy)²-3xy

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xy×(xy)²-3xyxy×(xy)²-3xyxy×(xy)²-3xyx^2+y^2-3xy=4x^2+y^2+2xy-5xy=4(x+y)^2-5xy=43^2-5x

xy×(xy)²-3xy
xy×(xy)²-3xy

xy×(xy)²-3xy
x^2+y^2-3xy=4
x^2+y^2+2xy-5xy=4
(x+y)^2-5xy=4
3^2-5xy=4
5xy=9-4
5xy=5
xy=1

这要是问什么啊