1. ($\frac{3x-1}{2}$)( $\frac{-2}{3x+1}$)=0
<=> $\frac{-(3x+1)}{3x+1}$ =0
<=> -1=0
<=> vô nghiệm
2. (3x-5)(x+3)=0
<=>$\left \{ {{3x-5=0} \atop {x+3=0}} \right.$
<=>$\left \{ {{x=\frac{5}{3}} \atop {x=-3}} \right.$
3. $x^{2}$ -4x +4=9
<=>$(x-2)^{2}$ = ±$3^{2}$
<=>$\left \{ {{x-2=3} \atop {x-2=-3}} \right.$
<=>$\left \{ {{x=5} \atop {x=-1}} \right.$
4.$4x^{2}$ -6x=0
<=> 2x(2x - 3)=0
<=>$\left \{ {{2x=0} \atop {2x-3=0}} \right.$
<=>$\left \{ {{x=0} \atop {x=\frac{3}{2}}} \right.$
5. 2x³ - $5x^{2}$ +3x=0
<=> 2x³ -$2x^{2}$ -$3x^{2}$ +3x=0
<=> $2x^{2}$ (x-1)- 3x(x-1)=0
<=>x(2x-3)(x-1)=0
<=>/x=0
/x=$\frac{3}{2}$
/x=1
