ДАЮ 30 БАЛЛОВ СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1) (5+4a)+(a+2a^3)
2) (y-7x^4)-(2,3-9x)
3) (9b+7c^2)-(14b-10c^2)
4) (39n^2-2m)+(5m-44n^2).