(2,5y-4)(6y+1,8)=0
15y² +4,5y - 24y - 7.2 = 0
15y² -19,5y - 7.2 = 0
D = 380.25 + 432=812.25
x1=(19.5+28.5) / 15 =3.2
x2=(19.5-28.5) / 15 = -0.6
ответ 3.2 , -0.6
(2,5y-4)(6y+1,8)=0
15y² +4,5y - 24y - 7.2 = 0
15y² -19,5y - 7.2 = 0
D = 380.25 + 432=812.25
x1=(19.5+28.5) / 15 =3.2
x2=(19.5-28.5) / 15 = -0.6
ответ 3.2 , -0.6