Упростите выражение.
1) mn^2/n^2-m^2*(2/m-2/n)
2) (c-d/d+2c/c-d):c^2+d^2/c-d
3)(x^2-y^2):(1/x+1/y)
4)(x/y+y/x-2):(x-y)
5)(a+b)^2:(1/a^2+1/b^2+2/ab)
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