先化简,再求值:2x눀-2y눀分之4x눀-8xy+4y눀乘xy(x-y)分之(x+y)눀,其中x=2,y=3...

2025-03-07 09:02:12
推荐回答(1个)
回答1:

原式=4(x-y)²/2(x+y)(x-y)*(x+y)/xy(x-y)
=2(x-y)/(x+y)*(x+y)/xy(x-y)
=2/xy
=2/(2*3)
=1/3