Question

|x-1|-2=0
Tìm x ( giải cụ thể cho mình )

Answer 1

`|x-1|-2=0`

`=> |x-1|=0+2`

`=> |x-1|=2`

\(\Rightarrow\left[{}\begin{matrix}x-1=2\\x-1=-2\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=3\\x=-1\end{matrix}\right.\)

Answer 2

|x-1|-2=0

<=>|x-1|=0+2

<=>|x-1|=2

\(< =>\left[{}\begin{matrix}x-1=2\\x-1=-2\end{matrix}\right.< =>\left[{}\begin{matrix}x=2+1\\x=-2+1\end{matrix}\right.< =>\left[{}\begin{matrix}x=3\\x=-1\end{matrix}\right.\)

Answer 3

|x - 1| - 2 = 0

|x - 1| = 0 + 2

|x - 1| = 2

x - 1 = 2 và x - 1 = -2

*) x - 1 = 2

x = 2 + 1

x = 3

*) x - 1 = -2

x = -2 + 1

x = -1

Vậy x = -1; x = 3