Question

Rút gọn biểu thức

(x - 1)³ + 3x(x - 1)² + 3x²(x -1) + x³ 

Answer 1

\(\left(x-1\right)^3+3\left(x-1\right)^2\cdot x+3\left(x-1\right)\cdot x^2+x^3\)

\(=\left(x-1+x\right)^3\)

\(=\left(2x-1\right)^3\)