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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 | 
