Question

упростите выражение (2x+y)(4x^2-2xy-x^2)-y^2(y-1)-7x^3.
1)x+3
2)y^2-x^3-3x^2
3)2xy-3x^2
4)4x^2+y^2

Answer 1

1.(2x+y)(4x^2-2xy-x^2)-y^2(y-1)-7x^3 = (2x+y)(3x^2-2xy)-y^3+y^2-7x^3 = 6x^3-4x^2y+3x^2y-2xy^2-y^3+y^2-7x^3 = -x^3-x^2y-2xy^2-y^3+y^2