Question

Giúp tui với, tks mn nha ^^!

Answer 1

a: Ta có: \(A=\left(2x-1\right)^2+\left(2x-2\right)^3+\left(2x+3\right)^3\)

\(=8x^3-12x^2+6x-1+8x^3-16x^2+16x-8+\left(2x+3\right)^3\)

\(=16x^3-28x^2+22x-9+8x^3+36x^2+54x+27\)

\(=24x^3+8x^2+76x+18\)

 

Answer 2

\(A=8x^3-12x^2+6x-1+8x^3-24x^2+24x-8+8x^3+36x^2+54x+27\\ A=24x^3+84x^2+18\\ D=x^3-3x^2+3x-1+x^3-6x^2+12x-8-x^3+9x^2-27x+27\\ D=x^3-12x+18\)