若2x-y=10,求【(x²+y²)-(x-y)²+2y(x-y)】/4y的值,没有做对不采纳
1个回答
【(x²+y²)-(x-y)²+2y(x-y)】/4y
=(x²+y² - x²-y² +2xy+2xy-2 y² )/4y
=( 4xy--2 y² )/4y
=(2x-y)/2
=10/2
=5
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