问题
解答题
先将
|
答案
∵x>0,y>0,且x-y>0,
∴原式=
×1 x-y
=x2(x-y) xy
×1 x-y
=x(x-y) y
=x y
.xy y
令x=2,y=1,则上式=
=1×2 1
.2
先将
|
∵x>0,y>0,且x-y>0,
∴原式=
×1 x-y
=x2(x-y) xy
×1 x-y
=x(x-y) y
=x y
.xy y
令x=2,y=1,则上式=
=1×2 1
.2