jj 326

txsnowsea · 发表于 2011-1-19 09:00:48

326. X^5Y<0？也是半个变体
（1）X(Y^3)<0
（2）XY^2>0
参考答案：B
思路：
条件一不充分，无法得知X，Y的正负，就知道是异号
条件二充分，可以得知，X>0, X^5Y>0

if we can know that X，Y是异号, we should know that X^5Y<0. right/? So the answer is D?

txsnowsea · 发表于 2011-1-19 09:01:48

Group1的工资range是3000，Group2的工资range是5000，如果把Group1和2合并，请问range最小为多少？选项：A. 2000(我选的这个，刚才有人问为什么，我怎么也想不起来怎么想的了，可能错了吧，我还纠结了好久……大家考场仔细看题) 其他选项的答案有5000，7000等
思路：如果问题问的是合并起来后，工资的range最小为多少；答案应该是5000。
如果是问合并起来后，两组数的range最小为多少，答案则是2000

I didn't get this one. could someone explain it to me? thx

sdcar2010 · 发表于 2011-1-19 09:14:56

如果问题问的是合并起来后，工资的range最小为多少；答案应该是5000

This is right. The range of the combined group should be no smaller than the range of either groups. If the difference between the salaries of A and B in Group B is 5000, the difference between the salaries of A and B would still be 5000 when group B joins group A.

didihzqjr · 发表于 2011-1-19 10:55:48

还是没有很懂能不能解释一下两个问题的区别啊谢谢

txsnowsea · 发表于 2011-1-19 11:07:21

如果问题问的是合并起来后，工资的range最小为多少；答案应该是5000

This is right. The range of the combined group should be no smaller than the range of either groups. If the difference between the salaries of A and B in Group B is 5000, the difference between the salaries of A and B would still be 5000 when group B joins group A.

-- by 会员 sdcar2010 (2011/1/19 9:14:56)

thx.

jj 326

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