1. X is a positive integer. 2-height of X is defined as the greatest negative integer n where 2^n is a factor of X. K and M are two positive integers. Whether 2-height of K is greater than 2-height of M?
a. K is greater than M
b. K is even times of M
2. X, Y and Z are three different prime numbers. How many factors does XYZ have?
3. XYZ?
a. XYZ1
b. XYZ^2=1
4. XYZ0?
a. XY0
b. YZ0
5. 7^37^4=?
6. A is 25% less than B and B is 25% less than C. How much percent is A less than C?
7. A can finish one job in X hours. A does this job three times as fast as B does. If A and B work together, how many hours can they finish the job?
8.能否确定N?, 条件是
1 ^1/2,^1/2 是连续整数
2 ^1/2,^1/2 是连续整数
我答D
9.还有就是两条平行线,一条有5个点,一条4个点问能组成多少个直角三角形
我答70个
10. 一个正三角形,边长5,中间内切一圆,问圆的面积
11. 在坐标系中有3点P,M,N,.问从P-N的距离比从P直接到N的距离大多少
12. R,S,T为正整数,问T/S^2是否是整数? 1)T/RS是整数 2)R/S是整数
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