|x-6|=12
⇒ \(\left[ \begin{array}{l}x-6=12\\x-6=-12\end{array} \right.\)
⇒ \(\left[ \begin{array}{l}x=18\\x=-6\end{array} \right.\)
Vậy x ∈ { -6 ; 18 }
10-|x+1|=3
|x+1|=7
⇒ \(\left[ \begin{array}{l}x+1=7\\x+1=-7\end{array} \right.\)
⇒\(\left[ \begin{array}{l}x=6\\x=-8\end{array} \right.\)
Vậy x ∈ { -8 ; 6 }
3.|x|=15
|x|=5
⇒\(\left[ \begin{array}{l}x=5\\x=-5\end{array} \right.\)
Vậy x ∈ { ±5 }
X.(x+5)=0
⇒ \(\left[ \begin{array}{l}x=0\\x+5=0\end{array} \right.\)
⇒\(\left[ \begin{array}{l}x=0\\x=-5\end{array} \right.\)
Vậy x ∈ { -5 ; 0 }
