Question

Answer 1

\(x^3-5x^2+x=5\)

\(\Leftrightarrow x-5=0\)

hay x=5

Vậy: Chọn B

Answer 2

`x^3-5x^2+x=5`

`<=>x(x^2+1)=5(x^2+1)`

`<=>x=5`

`->` B.

Answer 3

\(\Rightarrow x^2\left(x-5\right)+\left(x-5\right)=0\)

\(\Rightarrow\left(x-5\right)\left(x^2+1\right)=0\)

\(\Rightarrow x=5\)

=> Chọn B