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?
答
a1×a2=a2×a3,故a1=a3=a1q²,因此q²=1,公比为±1
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