Question

Срочно надо
$2 x^{2} +5x=0$
$x^{2} -6x=0$
$0,5x+10 x^{2} =0$
$3 x^{2} -12=0$
$4 x^{2} =36$
$64 x^{2} =1$
$100=81 x^{2}$