数学机经254题，有疑问

古蓝雨

254: DS X>10?
1)(1/x)+(1/y)=1/5
2) 1/x < 1/10

1）    不能
2）    可以~~
选B


如果X是负数呢？那么第二个条件也不可以确定。

magicloudyh

这题答案应该错了

zhipei

Yes, I also think the answer is incorrect.
From (2), we can get X>10 or X<0
So the correct answer should be E

sdcar2010

If X is negative, how could X be greater than 10?