已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程

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已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程

【(x²+y²)-(x-y)²+2y(x-y)】÷4y
=(x²+y²-x²+2xy-y²+2xy-2y²)÷4y
=(4xy-2y²)÷4y
=x-y/2
=1/2(2x-y)
=10/2
=5