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标题: 2月数学机经讨论帖【300-350题】16号更新 [打印本页]

作者: myice    时间: 2009-2-16 09:15     标题: 2月数学机经讨论帖【300-350题】16号更新

301. X10-20的一个数,问X是质数吗?

1X+1能被3整除

2X+2是质数

应该选C,因为X可以是1117,都是质数

 

302.  一种什么东西(好像是鱼),各个种类的数量分别是45xyz11(中间三个数记不清了,但我是按升序排列的),一段时间后,原来最少的那种增加了3,最多的那种增加了2,其他增加了1,问现在的range

 

答案:7。小心啊,4+3变成75+1只有6,最大的11+2=13,所以range13-6=7,不要看成13-7了。

 

303 ((360)^2)^3=?, 就是分解成质因子的N次方就好了.

 

304. m and n are the tens and unit difits of a number. a number is twice m*n, what is the m in terms of n?

 

305. how many number between 1-60 share are prime, excluding 2, 3 and 5?

 

306. 0.06 of 1/2?

 

307. (DS) is the median salary of 21 teachers less than the average:

1. the average salary is 445,200

2. the 12 of the leachers, each earn less than 21,000

 

308. (DS)Two concerts, x and y. what is y?

 a inequality was given but cant remember what was the inequality

1.       20x+15y>320

2.       X=3/4y

 

309. An Isoceles triangle has as sides 4 and 10, what is the perimetre?

 

1. 14

2. 18

3. 20

4. 24

5. 28

 

310. On a number line, 4 points, A, B, C and D, are separated by equal distance. A is -2^24 and B is -2^23, what is D?






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