Помогите пожалуйста!!! Мозг уже кипит...

Упростите
а) 2х^2 - 2у^2/х * 4х/х-у - 16ху/х+у

б) х-3/х^2+3х - х/9+3х : (9/х^3-9х + 1/х+3)

Найдите значение

а) 3-√5/3+√5 + 3+√5/3-√5 =

б) (√5-√2)(√5+√2) =
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