Question

[Văn Thắng Hồ]

BT lam tinh nhan

a)(x^3+2x^2y-5xy^2-3y^3)(5x-4y)

b)(x+1)(x-2)(2x-1)

c)(2x+y)(4x^2-2xy+y^2)

d)(a^3+a^2b+ab^2+b^3)(a-b)

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(=5x^4-4x^3y+10x^3y-8x^2y^2-25x^2y^2+20xy^3-15xy^3+12y^4\)

\(=5x^4+6x^3y-33x^2y^2+5xy^3+12y^4\)

b: \(=\left(x^2-x-2\right)\left(2x-1\right)\)

\(=2x^3-x^2-2x^2+x-4x+2\)

\(=2x^3-3x^2-3x+2\)

c: \(=8x^3+y^3\)

d: \(=a^4-b^4\)