x(x-1)-(x^2-y)=-4,求2分之x^2+y^2-xy的值
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x(x-1)-(x^2-y)=-4,求2分之x^2+y^2-xy的值x(x-1)-(x^2-y)=-4,求2分之x^2+y^2-xy的值x(x-1)-(x^2-y)=-4,求2分之x^2+y^2-xy
x(x-1)-(x^2-y)=-4,求2分之x^2+y^2-xy的值
x(x-1)-(x^2-y)=-4,求2分之x^2+y^2-xy的值
x(x-1)-(x^2-y)=-4,求2分之x^2+y^2-xy的值
x²-x-x²+y=-4
-x+y=-4
x-y=4
所以原式=(x²-2xy+y²)/2
=(x-y)²
=4²/2
=8
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