Question

tìm x biết :

|1-x|=3

Answer 1

1-x=3 

x=1-3

x=-2

hoặc

1-x=-3

x=1-(-3)

x=4

Answer 2

`|1-x|=3`

`@TH1:1-x=3=>x=1-3=-2`

`@TH2:1-x=-3=>x=1-(-3)=1+3=4`

Vậy `x=-2` hoặc `x=4`

Answer 3

= -2

Answer 4

\(\left|1-x\right|=3\\ \Leftrightarrow\left[{}\begin{matrix}1-x=3\\1-x=-3\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-2\\x=4\end{matrix}\right.\)

Answer 5

=> 1 + x = 3 hoặc 1+ x = -3

TH1: 1 + x = 3

      => x = 2

TH2: 1 + x = -3

      => x = -4

Vậy x = 2 hoặc x = -4