1. Is X>Y?
1). (X-Y)/X>0
2). (X^2-Y^2)/X^2>0
由条件(1)有: x-y与x同号, 结论:x可大于y,也可小于y
由条件(2)有: x^2-y^2>0, 即(x-y)与(x+y)同号, 结论:x可大于y, 也可小于y
选E LZ的答案本老菜鸟绝对支持。但不大懂您说得同号概念和做法,能否在普及一下这方面的知识和这类题的做法?万分感谢!只是不敢也绝不能叫您姐姐了!玩笑一个!
LZ的答案本老菜鸟绝对支持。但不大懂您说得同号概念和做法,能否在普及一下这方面的知识和这类题的做法?
万分感谢!只是不敢也绝不能叫您姐姐了!玩笑一个!
同号就是指同正或同负啊?异号就是指一正一负,呵呵,大家都不知道吗?那我从哪学来的?难道我不是中国人?
举报
Thanks to all of you!
15、A and B are in a line to purchase tickets. How many people are in the line?
1). There are 15 people behind A and 15 people in front of B
2). There are 5 people between A and B
C
我的答案是。因为尽管A 前和A 后及B 前B 后的数据都有了,但A 和B 谁前谁后则未定,因为将会导致结果。
请大家继续讨论本老菜鸟的跟贴!多谢!
这题肯定是E了,GWD 上有的
感谢"EMMA JJ"对同号问题的释疑.
说明我是中国人但确实在之前不知"同号"为何意?只怪自己当时没学好数学!
另SHQCO:关于15题的答案,我也是E,当时我是漏打了!多谢.
Solution:
For(1), if x>2, for x is a prime number, x should be 3,5,7..... that means x is an odd number.
then 3x is also odd.
so for condition 1,it;s unsufficient.
For(2), y is odd, also not sufficient.
But both (1) and (2), 3xy is odd multiple odd, it;s still odd.
10、What is the tens digit of positive integer x?
1). X divided by 100 has a remainder of 30
2). X divided by 100 has a remainder of 30
我确定题目错了!!
2). X divided by 100 has a remainder of 30 应该是 2). X divided by 110 has a remainder of 30
我刚问过的,OG里边的题目...
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=197610&page=1
13、If m and n are positive integers, is m/n a terminal decimal?
1). 90<m<100
2). n=4
答案是什么啊 B 还是 C 啊
怎么还会有OG的原题呢?想知道这位印度阿哥数学考了多少分啊。
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