已知:2x-y=10,求【(x2+y2)-(x-y)2+2y(x-y)】÷4y
1个回答
【(x²+y²)-(x-y)²+2y(x-y)】÷4y
=【(x²+y²)-(x²+y²-2xy)+(2xy-2y²)】/4y
=(4xy-2y²)/4y
=(2x-y)/2
=5
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