已知x(x-1)-(x²-y)=-3,求x²+y²-2xy的值.

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已知x(x-1)-(x²-y)=-3,求x²+y²-2xy的值.已知x(x-1)-(x²-y)=-3,求x²+y²-2xy的值.已知x(x-

已知x(x-1)-(x²-y)=-3,求x²+y²-2xy的值.
已知x(x-1)-(x²-y)=-3,求x²+y²-2xy的值.

已知x(x-1)-(x²-y)=-3,求x²+y²-2xy的值.
x(x-1)-(x²-y)=-3
x²-x-x²+y=-3
-x+y=-3
x-y=3
x²+y²-2xy
=(x-y)²
=3²
=9