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nikkoyu

Is positive integer n divisible by 3?
(1) n²/36 is an integer.
(2) 144/n² is an integer.      WHY the answer is: A?


If 500 is the multiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y, which multiple of 100 is closest to x+y?
(1) x<500
(2)x<400       我想请问一下这题什么意思？ 我看不懂题意。 惭愧！！

phoenixday

Is positive integer n divisible by 3?
(1) n²/36 is an integer.
(2) 144/n² is an integer.      WHY the answer is: A?


If 500 is the multiple of 100 that is closest to x and 400 is the multiple of 100 that is closest to y, which multiple of 100 is closest to x+y?
(1) x<500
(2)x<400       我想请问一下这题什么意思？ 我看不懂题意。 惭愧！！

-- by 会员 nikkoyu (2010/9/17 11:29:32)

第一题  1)n²  为36的倍数  那么  最小为6  肯定有  因子3在里面
         2）的话  举一个反例  n=4  

第二题  - -  见鬼了  看不懂