Question

Решите пожалуйста срочно надо!!!!!!!!!

Answer 1

b1 = -750, b2 = 150, b3 = -30

b2 = b1*q
q = b2:b1 = 150:(-750) = -1/5

S5 = b1*(1-q^5)/(1-q) = -750*(1+1/3125)/(1+1/5) = -750*3126/3125*5/6 = -3126/5 = -624,2