解!
[(x-y)^2(x+y)^-2/2(x+y)^2(x-y)^-2]^-3
=[（x-y)^2/(x+y)^2*(x-y)^2/2(x+y)^2]^-3
=[(x-y)^4/2(x+y)^4]^-3
=8(x+y)^12/(x-y)^12
另外发并点击我的头像向我求助,请谅解,
,你的采纳是我服务的动力.лл