1а) (4y^3+15y)-(17y-y^3) = 4y^3 + 15y - 17y + y^3 = 5y^3 - 2y1б) 2a(3a-в+4) = 6a^2 - 2аb + 8a
2а) 2*ав-в^2 = 2ab - b^22б) 2х^3+4x^6 = 2x^3(1 + 2x^3)
1а) (4y^3+15y)-(17y-y^3) = 4y^3 + 15y - 17y + y^3 = 5y^3 - 2y
1б) 2a(3a-в+4) = 6a^2 - 2аb + 8a
2а) 2*ав-в^2 = 2ab - b^2
2б) 2х^3+4x^6 = 2x^3(1 + 2x^3)