Question

已知数列{an}是等差数列，{bn}是等比数列，且a1=b1=2,b4=54,a1+a2+a3=b2+b3,求数

Answer 1

b4 = b1* q^3,所以公比q = 3，b2 = b1*3 = 6，b3 = b1*3*3 = 18. a1+a2+a3 = 3*a2 = 6+18，所以
a2 = 8，所以公差d = a2 -a1 = 6. a3 = 8+6 = 14.

Answer 2

a=b=2,p=6,q=3;