刊登于陕西师大主办的《中学数学教学参考》1996年第12期第27页的例10提出的问题是：已知数列｛an｝是首项a1＞0，公比q＞-1且q≠0的等比数列，设数列{bn}的通项bn＝an＋1-kan＋2（n=1，2，3，...），数列｛an｝、｛bn｝的前n项和分别是Sn、Tn，如果Tn＞ksn对一切自然数n都成立 The question raised by Example 10, published in the “Middle School Mathematics Teaching Reference” sponsored by Shaanxi Normal University, on page 27 of the 12th issue of 1996, No. 12, 1996 is: Known sequence {an} is the first item a1>0, public ratio q>-1 and q The geometric sequence of ≠0 sets the general term bn=an+1-kan+2 (n=1,2,3,...) of the series {bn}, the first n terms of the {an}, {bn}, and Sn , Tn, if Tn>ksn is true for all natural numbers n