Question

Rút gọn biểu thức :

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

b,\(\left(x-3\right)^3-\left(x-3\right)\left(x^2+3x+9\right)+6\left(x+1\right)^2\)

Answer 1

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

\(=x^3-3x^2+3x-1-x^3+1\)

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

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

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

\(=-9x\left(x+3\right)\)

Answer 2

hepl me T.Thùy NinhToshiro KiyoshiXuân Tuấn TrịnhNguyen Bao Linh