срочно
1)8х^5у^8 - 24х^3у^5 - 2х^2у^2 =
2)6m^6n^7 - 54m^4n^8 - 3m^3n^3 =
3)12m(5m - m) + 16^2(m - 5) =
4)24x(x - 3) - 6(3 - x) =