- 各位xdjm，帮帮忙啊！这几题怎么都没算到答案。让我开始怀疑自己的数学能力了。郁闷阿……
In the figure, points A, B, C, D, and E lie on a line. A is on both circles, B is the center of the smaller circle, C is the center of the larger circle, D is on the smaller circle, and E is on the larger circle. What is the area of the region inside the larger circle and outside the smaller circle? (1)
AB = 3 and BC =2 (2)
CD =1 and DE = 4
就是那两个圆的题，那个图我贴不上来。 为什么不选 D
2、At a certain company, each employee has a salary grade s that is at least 1 and at most 5. Each employee receives an hourly wage p, in dollars, determined by the formula p = 9.50 + 0.25(s – 1). An employee with a salary grade of 5 receives how many more dollars per hour than an employee with a salary grade of 1? A. $0.50 B. $1.00 C. $1.25 D. $1.50 E. $1.75 为什么不是选 B 。 3、If n is an integer and 100 < n <200, what is the value of n? (1) n/36 is an odd integer. (2)n/45 is an even integer. 答案是C。 为什么不选B . （ 在100 < n <200中，能整除45的只有135和180。）
[此贴子已经被作者于2006-7-23 13:09:18编辑过] | 
