高一上數學-等比數列

S(10) = 33 S(5)

a(1 - r^10) / (1 - r) = 33a(1 - r^5) / (1 - r)

1 - r^10 = 33(1 - r^5)

(1 - r^5)(1 + r^5) = 33(1 - r^5)

1 + r^5 = 33

r^5 = 32

r = 2

此列數之公比 = 2