book Maths Puzzle Numerical Ability

Simlify. (x-y/x+y)+(x+y/x-y)
x2-y+xy/x+x3-xy2

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Please help me with these problem..
solve by any method.
1)x^2+25=10x
2)10h-2=11h^2 Find the distance between the pair of points whose coordinates are given. Express answers in simplest form using radicals or as decimal approximations.
(7,2)(-5,7)

I'm not qui