d = s7 - s6 = s7 - s4 - 2d = 7 - 22 - 2d
3d = - 15
d = -5
s1 = s7 - d(7-1) = 7 -(- 5*6) = 37
ОТВЕТ -5 и 37
d = s7 - s6 = s7 - s4 - 2d = 7 - 22 - 2d
3d = - 15
d = -5
s1 = s7 - d(7-1) = 7 -(- 5*6) = 37
ОТВЕТ -5 и 37