1)3х^2=-18x
3x^2+18x=0
3x(x+6)=0
3x=0 или x=-6
2)2x^2-3x=0
x(2x-3)=0
x=0 или x=1.5
16-x^2>=0, x!=0
q=-5
6/24=0.25
7/4=1.75
3/2=1.5
9/5=1.8
3/25=0.12
12/75=0.16
17/200=0.085
123/20=6.15