1 24 : (3x - 2) =-3
⇔3x - 2=24 : (-3)
⇔3x - 2=-8
⇔3x =-8+2
⇔3x =6
⇔3x =6 : 3
⇔ x =1
Vậy x=1
2 -45 : 5.(-3 - 2x)=3
⇔-9.(-3 - 2x)=3
⇔ -3 - 2x =3:(-9)
⇔ -3 - 2x =-1/3
⇔ - 2x =-1/3+3
⇔ - 2x =8/3
⇔ x =8/3:(-2)
⇔ x =-4/3
3 x.(x + 7) =0
⇔\(\left[ \begin{array}{l}x=0\\x + 7=0\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=0\\x=-7\end{array} \right.\)
Vây x=0; x=-7
4 (x + 12).(x-3) =0
⇔\(\left[ \begin{array}{l}x + 12=0\\x-3=0\end{array} \right.\)⇔\(\left[ \begin{array}{l}x=-12\\x=3\end{array} \right.\)
Vây x=-12; x=3
5 x.(2 + x).(7 - x) =0
⇔\(\left[ \begin{array}{l}x=0\\2 + x=0\end{array} \right.\)
hoặc 7 - x=0
⇔\(\left[ \begin{array}{l}x=0\\x=-2\end{array} \right.\)
hoặc x=7
Vậy x=0;x=-2;x=7
6 (x-1).(x+2).(-x - 3) =0
⇔\(\left[ \begin{array}{l}x-1=0\\ x+2 =0\end{array} \right.\)
hoặc x -3 =0
⇔\(\left[ \begin{array}{l}x=1\\x=-2\end{array} \right.\)
hoặc x=3
Vậy x=1;x=-2;x=3
