(12y +18)(1.6-0.2y)=0
12y*1.6-12*0.2y+18*1.6-18*0.2y=0
19.2y-2.4y^2+28.8-3.6y
(-2.4y^2+15.6y+28.8)/-2.4
y^2-6.5y-12=0
D=√(42.25-4*(-12))=9.5
x1=(6.5+9.5)/2 = 8
x2=(6.5-9.5)/2 = - 3/2
ответы x1 =8 x2= - 3/2
(12y +18)(1.6-0.2y)=0
12y*1.6-12*0.2y+18*1.6-18*0.2y=0
19.2y-2.4y^2+28.8-3.6y
(-2.4y^2+15.6y+28.8)/-2.4
y^2-6.5y-12=0
D=√(42.25-4*(-12))=9.5
x1=(6.5+9.5)/2 = 8
x2=(6.5-9.5)/2 = - 3/2
ответы x1 =8 x2= - 3/2