已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值

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已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值已知x+y=10,求[(x+y)^2-(

已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值
已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值

已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值
[(x+y)²-（x-y）²-2y（x-y）]÷5y
=[X²+2XY+Y²-X²+2XY-Y²-2XY+2Y²]÷5Y
=[2Y(X+Y)]÷5Y
=2/5(X+Y)
=2/5(10)
=4

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