45y(2)-13.5y-72y+21.6=0
45y(2)-85.5+21.6=0
D=3422.25
y=85.5+58.5\90=3.3
y2=85.5-58.5\90=3
(15y-24)(3y-0,9)=0
45y квадрат - 13.5y-72y+21.6=0
45y квадрат-85.5y+21=0
D=2025+7182=9207
^D=95,96
x1,2=85,5+-95,96 x1=2,1 x2=-0,12
90
