题库搜索>问题求解PS-12973
If S is the sum of the reciprocals of the consecutive integers from 91 to 100, inclusive, which of the following is less than S?
I. 1/8
II. 1/9
III. 1/10
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
s=1/91+1/92+……+1/100 所以 10/100 <s<10/91 所以选c
刘易斯
这道题做的时候实在没有思路，局限在（1-1/2）+（1/2-1/3）...这个套路里了 实际上可以用不等式放缩一下 ！！！10/100<1/91+...+1/100<10/91 所以大于1/10 小于1/9
0
0
回复
2021-09-17 16:25:08
科目：
问题求解PS
来源：
GWD
题目信息2m9s
平均耗时
78.2%
平均正确率
该题由网友9SCx4U提供
点击上传问题求解PS -17741
The sum of the first 100 positive integers is 5,050. What is the sum of the first 200 positive integers?
问题求解PS -17564
If the sequence x1 , x2 , x3 , …, xn , … is such thatx1 = 3 and xn+1=2xn−1 for n ≥ 1, then x20−x19 =
问题求解PS -17542
The numbers 3, 10, 17, 24, 31, and 38 are the first six terms of an infinite sequence in which each term after the first is 7 greater than the preceding term. What is the 45th term of the sequence?
问题求解PS -16708
【OG20-P153-50题】If S=1+122 +132 +142 +152 +162 +172 +182 +192 +1102 ,which of the following is true?
数据充分DS -15686
If the units digit of integer n is greater than 2, what is the units digit of n ?(1) The units digit of n is the same as the units digit of n2 .(2) The units digit of n is the same as the units digit of n3 .
问题求解PS -17741
The sum of the first 100 positive integers is 5,050. What is the sum of the first 200 positive integers?
问题求解PS -17564
If the sequence x1 , x2 , x3 , …, xn , … is such thatx1 = 3 and xn+1=2xn−1 for n ≥ 1, then x20−x19 =
问题求解PS -17542
The numbers 3, 10, 17, 24, 31, and 38 are the first six terms of an infinite sequence in which each term after the first is 7 greater than the preceding term. What is the 45th term of the sequence?
问题求解PS -16708
【OG20-P153-50题】If S=1+122 +132 +142 +152 +162 +172 +182 +192 +1102 ,which of the following is true?
数据充分DS -15686
If the units digit of integer n is greater than 2, what is the units digit of n ?(1) The units digit of n is the same as the units digit of n2 .(2) The units digit of n is the same as the units digit of n3 .
分享
周末、晚班滚动开班 
24+35+35+6课时 
