Ta có: | 23 + x | -42 = -31
\(\Leftrightarrow\)| 23 + x | = -31 +42 = 42 - 31 = 11
\(\Leftrightarrow\orbr{\begin{cases}23+x=11\\23+x=-11\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x=11-23\\x=-11-23\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x=-12\\x=-34\end{cases}}\)
Vậy \(x\in\left\{-34;-12\right\}\)
! 23 + x ! - 42 = -31
23 + x - 42 = - 31
23 + x = ( - 31 ) + 42
23 + x = 11
x = 11 - 23
x = - 12
tk nha
!23+x!-42 =-31
!23+x! =-31+41
!23+x! =10
th1:23+x=10 th2:23+x=-10
x=10-23 x=-10-23
x=-13 x=-33
hi bạn