HMMT 十一月 2012 · THM 赛 · 第 1 题
HMMT November 2012 — THM Round — Problem 1
题目详情
英文原题
[4] Ifxx= 201220122013, findx.
解析
英文解析
- [ 3 ] If 4 = 2 , find n .
Answer: 4 We rewrite the left hand side as
4 4 9
2 4 2 · 4 2
(2 ) = 2 = 2 ,
and the right hand side asn n
2 2 − 7
1 ( )
2 2
(2 ) = 2 .128
Equating, we find 2 − 7 = 9, yielding n = 4.n
2013
x 2012