化简求值:[(x+y)(x-y)-(x-y)2+2y(x+y)]÷2y,其中x=1,y=1

化简求值:[(x+y)(x-y)-(x-y)2+2y(x+y)]÷2y,其中x=1,y=1.
2025-05-22 14:16:48
推荐回答(1个)
回答1:

[(x+y)(x-y)-(x-y)2+2y(x+y)]÷2y
=[x2-y2-x2+2xy-y2+2xy+2y2]÷2y
=(4xy÷2y
=2x,
当x=1,y=1时,原式=2×1=2.