12/20 北美
Math:

1) 圆和一个正方形最多几个交点？

8

2）所有的两位数 （both digits are odd) 的和。

1375

3）一个三角形，三个顶点坐标给出。任何一条边都不平行x，y轴。求面积

计算每边边长就能发现，这个三角形是个直角三角形。三边是大概这样的 sqrt(25) sqrt (110) sqrt (135)。 所以面积就是1/2*sqrt(25)*sqrt(110).

4）数列。a(n+1)=a(n)+ (-1)^n/n 问a1, a2, a3的关系。

a2

5).T= 5, 10, .... 50; S=6,12,...60. S-T=?

55

6) 一个钟可以准确表达时间。一个演唱会持续了多长时间？

A. 是8点钟开始的。

B. 时针走了64度。

B.

遇到了四五道他人16日之后的jj，就不重复了。

AWA:

1) Hippocrene Plumbing Supply recently opened a wholesale outlet in the location once occupied by the Comquat Cafe.Hippocrene Plumbing Supply has apparently been quite successful there because it is planing to open a large outlet in a nearby city.But the C cafe,one year after moving to its new location,has seen its volume of business drop somewhat from the previous year's.Clearly, the former site was the better business location, and the C Cafe has made a mistake in moving to its new address.
Discuss how well reasoned.....

2) All citizens should be required to perform a specified amount of public service

M:51. V:44. T:770. long time luker. 1st post. Thank CD'ers for all the info. Bye for now. Good luck to all.