您好:
(1/x-y+1/x+y)/2x/x^2+2xy+y^2
=(x+y+x-y)/(x+y)(x-y)÷2x/(x+y)²
=2x/(x+y)(x-y)÷2x/(x+y)²
=(x+y)/(x-y)
因为x=-2
所以代入得(-1+y)/(-2-y)
您好:
(1/x-y+1/x+y)/2x/x^2+2xy+y^2
=(x+y+x-y)/(x+y)(x-y)÷2x/(x+y)²
=2x/(x+y)(x-y)÷2x/(x+y)²
=(x+y)/(x-y)
因为x=-2
所以代入得(-1+y)/(-2-y)