x(x-1)-(x2-y)=-3,求x2+y2-2xy的值

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

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
所以x-y=3
所以原式=(x-y)2=9

x(x-1)-(x2-y)=-3
x2-x-x2+y=-3
-x+y=-3
所以x-y=3
所以原式=(x-y)2=9 过程和答案!

x²-x-x²+y=-2 -x+y=-2 x-y=2 求的式子应该是(x²+y²)/2-xy吧? (x²+y²)/2-xy =(x²-2xy+y²)/2 =(x-y)²/2 =(2)²/2 =4/2 =2