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标题: 数学题 [打印本页]

作者: felixroman 时间: 2012-8-27 06:58 标题: 数学题

If m is a positive odd integer between 2 and 30, then m is divisible by how many different positive prime numbers? A
(1) m is not divisible by 3.
(2) m is not divisible by 5.
我觉得第二个也可以推出结论啊？
182. 17777-!-item-!-187;#058&011599
If m and r are two numbers on a number line, what is the value of r ? E
(1) The distance between r and 0 is 3 times the distance between m and 0 .
(2) 12 is halfway between m and r.
这题有两个条件应该可以算出来吧？

作者: eyesoneye 时间: 2012-8-27 21:08

第一题条件二下，存在21，可以被3和7同时整除，而剩余的数只能被一个prime number整除，所以不对吧。
第二题就算有两个条件，算出来也有r=18,m=6和r=36,m=-12两种情况，所以选E吧。

作者: felixroman 时间: 2012-8-29 20:42

谢谢！

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