1.5 = 3/2
18 1/3 = 55/3
3/2-1/4 = (3*2-1)/4= 5/4
5/4:55/3 = 5/4*3/55 = 3/(4*11) = 3/44
A1=16/27
A5=16/27*q^4=3
q=1.5
значит A2=16/27*1.5=8/9
A3= 16/27*(1.5)^2=16/27*2.25=4/3
A4= 16/27*(1.5)^3=16/27*3.375=2
Ответ: 8/9; 4/3; 2
<span>{х-у=-2
{х-2у=4
{x-y=-2
{-x+2y=-4
y=-6
x-(-6)=-2
x=-8
Otvet: (x,y)=(-8,-6)</span>