已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y

分类: 作业答案 • 2021-11-12 23:34:40

问题描述：

已知2x-y=10,求[(x&sup2+y&sup2)-(x-y)²+2y(x-y)]/4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y就是已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y/4y就是除以4y

答

先化简[(x²+y²)-(x-y)²+2y(x-y)]/4y [(x²+y²)-(x-y)²+2y(x-y)]/4y =[x²+y²-(x²+y²-2xy)+2xy-2y²]/4y=[x²+y²-x²-y²+2xy+2xy-2y²]/...