题库搜索>问题求解PS-13579
If N = 1/3 + 1/32 + 1/33, then N is between
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
直接计算出N的值会比较简单,N=13/27,在确定其范围
Ariadne
放缩法,两头乘以3,分别是1/3,和1,所以8/9小于一,最接近
ShawnLi
最小1/3,最大不超过1。
Yolandaguan
1/3+1/3^2+1/3^3 = 13/27 1/2 = 13.5/27 so, 1/3 < n < 1/2
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