已知2X-Y=0,求X^2-2XY+Y^2分之2X+Y乘以(X-Y)的值.
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已知2X-Y=0,求X^2-2XY+Y^2分之2X+Y乘以(X-Y)的值.
已知2X-Y=0,求X^2-2XY+Y^2分之2X+Y乘以(X-Y)的值.
已知2X-Y=0,求X^2-2XY+Y^2分之2X+Y乘以(X-Y)的值.
2X-Y=0,2x=y
(2X+Y)/(X^2-2XY+Y^2)×(X-Y)
=4x/(x^2-4x^2+4x^2)×(-x)
=-4