Đáp án:
Giải thích các bước giải:
a,x.(x-2)=0
\(\left[ \begin{array}{l}x=0\\x-2=0\end{array} \right.\)
\(\left[ \begin{array}{l}x=0\\x=2\end{array} \right.\)
b,x.(x-2)>0
$\left \{ {{x>0} \atop {x-2>0}} \right.$
$\left \{ {{x>0} \atop {x>2}} \right.$
c,x.(x-2)<0
*,$\left \{ {{x>0} \atop {x-2<0}} \right.$
$\left \{ {{x>0} \atop {x<2}} \right.$
*,$\left \{ {{x<0} \atop {x-2>0}} \right.$
$\left \{ {{x<0} \atop {x>2}} \right.$