Question

1) 2x/x²-y +5x-2y/y²-x²
2) a²b/ab-2 +ab²/ab-2 +2a+2b/2-ab

Answer 1

x²-xy-2y²=0 x²+y²=20 x²-xy-2y²=0 x²+xy-2xy-2y²=0 x(x+y)-2y(x+y)=0 (x-2y)(x+y)=0 x+y=0 x²+y²=20 x=-y x²+y²=20 (-y)²+y²=20 y²+y²=20 2y²=20 y²=10 y=-√10 ∨ y=√10 x=√10 ∨ x=-√10 x-2y=0 x²+y²=20 x=2y x²+y²=20 (2y)²+y²=20 4y²+y²=20 5y²=20 y²=4 y=-2 ∨ y=2 x=2*(-2) ∨ x=2*2 x=-4 ∨ x=4