2x²-x(2x-y)-y(2x-y)2x平方-x(2x-y)-y(2x-y)
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2x²-x(2x-y)-y(2x-y)2x平方-x(2x-y)-y(2x-y)2x²-x(2x-y)-y(2x-y)2x平方-x(2x-y)-y(2x-y)2x²-x(2
2x²-x(2x-y)-y(2x-y)2x平方-x(2x-y)-y(2x-y)
2x²-x(2x-y)-y(2x-y)
2x平方-x(2x-y)-y(2x-y)
2x²-x(2x-y)-y(2x-y)2x平方-x(2x-y)-y(2x-y)
2x²-x(2x-y)-y(2x-y)
=2x²-2x²+xy-2xy+y²
=y²-xy
=y(y-x)