3月17日JJ

戴安娜

以下是引用香柔cheese在2009-3-18 23:57:00的发言：

如果最小的组合68+68+73+73+73=355>350了，那就说明不可能同时满足条件range是5并且average是70了。因为如果range是5，那么average就大于70了。

我觉得那正好说明median 不是73.应该选C,比如68+68+68+73+73=350

gh2008

agree

wangxiaoqing

4. 天蝎47 (PS)
-with graph.  A right triangle inscribes in semicycle and crosses the
center, triangle's two sides are 6 and 8, asking what's rate of cycle
area to triangle?

我的题目让求的是semi cycle，答案：25pai/48

should be 25pai/24, asking the circle, not semicircle

10.
                            天蝎94
                         15n 除以6的余数  1) 15n能被2整除; 2) 15n 能被3整除

答案A

1: 15n=2,4,6,8, remainder is different

2: 15n=3,6,9,12,remainder is different

1+2: 15n=6k, 6k/6=k, so remainder is always zero

so answer is C

wangxiaoqing

12.
                            天蝎99问数字A离10^(-2)近还是离10^(-3)近？

条件1:A离10^(-1)比离10^(-4)近
                        条件2:A离10^(-2)比离10^(-3)近

1: A is on the right of 10^(-2), so A is closer to 0.01

2: A离10^(-2)比离10^(-4)近, not certain, because the mark is at 0.00495

at 0.00495-0.00499, A is closer to 0.001, at >0.005, A is closer to 0.01

so answer is A