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标题: 9月数学JJ 36解释有错误。。。 [打印本页]

作者: lazysun    时间: 2008-9-16 10:51     标题: 9月数学JJ 36解释有错误。。。

36. [a] is the smallest integer with a value larger than a. What is [a]-?

     1. a-b=1.5

      2. 忘了

1) IF a=2.5, b=1, [a]-=3-1=2
    
IF a=1.6, b=0.1,
[a]-=2-1=1
 
è INSUFF


IF a=2.5, b=1, should be 2 but not 1based on the requirement. however when a=3, b=1.5, [a]=4, =2, [a]-=2
The result of insufficient is right, but the reason is wrong


ALSO

4.三个班ABC,有9个人同时上AB14个人同时上AC,没人同时上BC,问有几个学生至少上一个班?

1、三个班人数相等

2、三个班各自的人数相加为325(这个数字实在记不清楚了,印象里好像是这个,大家看时小心)

答案我选的b

人数:325-14-9


Q:是否考虑存在3个班都上的,那样的话就应该选E




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