245.N是能被14整除的整数，问N是多少？
（1）3N能被5整除 （2）N能被28整除 E
246.X/Y=? (1)Y=X+10 (2)Y=1.01X B
247. n为正整数，n是某个正整数的平方，求n的因子数一定是什么数？
（1）一个奇数 （2）不记得 （3）一个质数 （2）可以排除 ANS: (1)
248.(X+C)^2的算式中，X可以为所有实数，C为一个常数，C是多少？
（1）C>0 (2)C^2=16 C
249.n=0.67K9, 能否判断K是否小于3？
（1）n精确到千分位，n=0.673 (2)n精确到百分位，n=0.67 ANS: A
250.L和M驾驶一辆车一同行驶(L和M各行驶一段路程)，平均速度为90mile/ hour.。求L的平均速度是否大于80？
（1）M的平均速度大于100 （2）M的时间大于L的时间
C
251.有一对整数，求它们的和是多少？
（1）至少有一个数为正整数 （2）至少有一个数为负整数C
252. A company invests in certain product in 1994, what’s the total amount in 1995
a. Monthly interest is ??% （real number）
b. The investment is $???
253． The mean of x, y, z is 10, x i. 9
ii. 10
iii. 11
a.I only
b. II only
c. III only
d. I and III
e. I, II, and III
254． A retailer sell red and white t-shirts in both medium and large size. The number of medium white sold is 3 times as many as large red sold. The number of medium white sold is 2 times that of large white. Total revenue of red is 80, total revenue of white is 190 Grand total is $1080. how much is the medium white ? (number are close, but not exactly accurate, just get the concept, number doesn’t matter).
255． {Sqrt(x)+ Sqrt(y) } / (Sqrt(x) -Sqrt(y)) - Sqrt(24)/ {Sqrt(x)^2- Sqrt(y)^2}, simply the above equation. 5 choices. Just use (a^2-b^2=(a+b)(a-b), you can easily identify the answer)
256． 6 balls, numbered 1-6, pick one at a time without replacement (exact words， faint again), the order doesn’t matter, what’s the possible combination
a. 10
b. 20
c. 30
d. 40
e. 50 这题搞了我很久，丢脸，大侠帮忙看看，数字因该准确，总之不上百
257． What is the reminder of x when it is divided by 9
a. Know the remainder of x when it is divided by 3
b. Know the remainder of x when it is divided by 3
258． N is a two-digit number, what’s the tens of n?
a. The tens of 2n =5
b. The tens of 2n=0
259． X increase annually by 20% in 1994 and 1995, Y increase by 40% in 1994 then by 1% of the amount of the previous year in 1995. which of the following must be true.
a. X-y<2
b. 0 c. 0 d. 0 e. ??
260． xy>0
a. |x|=|y|
b. x^2=y
261． The center of a circle at (-3,0),the distance of the two points on x axis where the circle intersect is 8, what’s the circumference
262.长方形ABCD，AB长6，BC长9。P是DA上任意一点。问：PB长小于√45的几率是多少？答：3/8
