Đáp án:
`↓↓`
Giải thích các bước giải:
`a) |x+1|-16=-3`
`=> |x+1|=-3+16`
`=> |x+1|=13`
`=>` \(\left[ \begin{array}{l}x+1=13\\x+1=-13\end{array} \right.\) `=>` \(\left[ \begin{array}{l}x=12\\x=-14\end{array} \right.\)
`b) 12-|x-9|=-1`
`=> |x-9|=12-(-1)`
`=> |x-9|=13`
`=>` \(\left[ \begin{array}{l}x-9=13\\x-9=-13\end{array} \right.\) `=>` \(\left[ \begin{array}{l}x=22\\x=-4\end{array} \right.\)
`c) |x+1|+12=5`
`=> |x+1|=5-12`
`=> |x+1|=-7`
Vì `|x+1|>=0`
`=> |x+1|=-7` vô lý
