等比数列练习题:若等比数列{An}满足AnAn+1=16,求公比?

问题描述:

等比数列练习题:若等比数列{An}满足AnAn+1=16,求公比?

a1×a2=a2×a3,故a1=a3=a1q²,因此q²=1,公比为±1