Question

x3−3x2+3x−1

Answer 1

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

\(=x^3-3x^2.1+3x.\left(-1\right)^2-1^3\)

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

Answer 2

(x+a)3=x3+(a+a+a)x2+(a.a+a.a+a.a)x+a3

(x−1)3→a=−1

⇒(x−1)3=x3+(−1−1−1)x2+(1+1+1)x+(−1)3

=x3−3x2+3x−1

Answer 3

TL:

=\(x^3-3x^2.1+3x.1^2-1\) 

=\(\left(x-1\right)^3\) 

hc tốt

Answer 4

x3-3x2+3x-1

=3x-6x+3x-1

=-1