Ответы и объяснения

2014-03-20T15:12:18+04:00
1) 6х^2 - 18x = 0
6x(x-3)=0
x=0; x=3
2) 3x^2 +4x +1 = 0
D = 4
x=-1/3; x=-1
3) 2x^2 - 18 = 0
2x^2=18 /2
x^2=9
x=3; x=-3