№2
2х²-8х
х³у+х²у²
№3
9х²+6х+1
х²-2ху³+у⁶
№4
(а³(а²+а⁵-2))/(-а³) + (4а²-9) = -(а²+а⁵-2)+(4а²-9) = -(1+1-2)+(4*1-9)=-5
№1
3х²+2х-1+(х³-3х²) = 3х²+2х-1+х³-3х² = х³+2х-1
6х²-14х+15х-35+4х²+2х-2х-1=10х²-25х+6х-15
10х²+х-35=10х²-19х-15
10х²-10х²+х+19х=35-15
20х=20
х=1