Question

Answer 1

2 nghiệm 

`|2x-4|=x+2(x>=-2)`

`+)2x-4=x+2`

`<=>2x-x=2+4`

`<=>x=6(tm)`

`+)2x-4=-x-2`

`<=>3x=2`

`<=>x=2/3(tm)`

Vậy pt có 2 nghiệm

Answer 2

\(\left|2x-4\right|=x+2\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-4=x+2\\2x-4=-x-2\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=6\\x=\dfrac{2}{3}\end{matrix}\right.\)

\(\Rightarrow C\)

Answer 3

B. 1 nghiệm