50,02
Объяснение:
100=(x+y)/(x-y)+(x-y)/(x+y)=[(x+y)²+(x-y)²]/(x²-y²)=2(x²+y²)/(x²-y²)⇒
⇒(x²+y²)/(x²-y²)=50⇒(x²-y²)/(x²+y²)=1/50=0,02
(x²+y²)/(x²-y²)+(x²-y²)/(x²+y²)=50+0,02=50,02