48 недель в году!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-0.5у=-0.25х-1
0.5у=0.25х+1
у=0.5х+2
=(a-2c)²/3(a-2c)=(a-2c)/3
a=8 c=1 (8-2)/3=6/3=2
Задание 1
a(n)=3n+9
a(1)=12
a(30)=99
S=(a(1)+a(30))/2*n=(12+99)/2*30=1665
Задание 2
25000*(1+0,002)^6=28154,06