L
lta2151995


Cho x>0 ; y< 0; x+y=1
Rút gọn
a/[TEX]A=\frac{y-x}{xy}:[\frac{y^2}{(x-y)^2}-\frac{2x^2y}{(x^2-y^2)^2}+\frac{x^2}{y^2-x^2}][/TEX]
b/
CMR A<-4
Rút gọn
a/[TEX]A=\frac{y-x}{xy}:[\frac{y^2}{(x-y)^2}-\frac{2x^2y}{(x^2-y^2)^2}+\frac{x^2}{y^2-x^2}][/TEX]
b/
CMR A<-4