Question

Rút gọn các biểu thức sau:

a.) (x+3)(x²-3x+9)-(54+x³⁾

Answer 1

\(\left(x+3\right)\left(x^2-3x+9\right)-\left(x^3+54\right)\)

\(=x^3+3^3-x^3-54\)

\(=27-54\)

\(=-27\)

Answer 2

a) (x+3)(x²-3x+9)-(54+x³)

= x³-3x²+9x+3x²-9x+27-54+x³

= -27

Answer 3

\(\left(x+3\right)\left(x^2-3x+9\right)-\left(54+x^3\right)\)

\(=x^3-3x^2+9x+3x^2-9x+27-54-x^3\)

\(=-27\)