Question

Giúp tui plsss

Answer 1

Bài 5: 

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

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

=-2

Answer 2

Bài 5:

a: Ta có: \(A=\left(3x+7\right)\left(2x+3\right)-\left(3x-5\right)\left(2x+11\right)\)

\(=6x^2+9x+14x+21-6x^2-33x+10x+55\)

=76

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

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

=2