1)(3х5-2х2+4х)-(3х5+х)-(х3-2х2-5)
2)(х-2)(х-4)-(х-1)(х-3)+(-5-3х)
1)3x5-2x2+4x-3x5-x-x3+2x2+5=-x3+3x+5
2)x2-4x-2x+8-x2+3x+x-3-5-3x=2x