| 查看: 891 | 回复: 13 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
erictan2046铜虫 (正式写手)
|
[求助]
【求助】每题5个金币，因为英文我不是很会，所以救助于高手解题。
|
||
|
问题： 1： Oyla the ant starts on one of the vertices of a cube whose edges have length 1. She wants to walk along every edge of the cube and return to her starting point, making the length of her journey as short as possible. what is the length of her journey? A.12 B.14 C.15 D.16 E.20 2. Ten different numbers are written down. Any number that is equal to the product of the other nine number is then underlined. How many numbers can be underlined at most? A.1 B.2 C.3 D.9 E.10 3. Several point are marked on a line, and all possible line segments are constructed between pairs of these points. One of the points lies on 80 of these segments; another point lies on 90 segments. How many points were marked on the line? A.20 B.22 C.80 D.90 E. impossible to determine  |
回复此楼» 猜你喜欢
职称评审没过，求安慰
已经有54人回复
-
垃圾破二本职称评审标准
已经有19人回复
-
毕业后当辅导员了，天天各种学生超烦
已经有5人回复
-
26申博自荐
已经有3人回复
-
A期刊撤稿
已经有4人回复
snowwhite1
木虫 (小有名气)
- 应助: 5 (幼儿园)
- 金币: 4484.2
- 帖子: 275
- 在线: 104.1小时
- 虫号: 1182357
- 注册: 2011-01-03
- 性别: GG
- 专业: 数论
|
简单描述吧。设第一数是其余各数的积，不妨设存在另外一个数假设是最后一个数，也是其余各数的积，列方程组，知第一数和最后一个数互为相反数，相反数只有一个，故选2 发自小木虫Android客户端 |
12楼2017-02-18 23:21:35
snowwhite1
木虫 (小有名气)
- 应助: 5 (幼儿园)
- 金币: 4484.2
- 帖子: 275
- 在线: 104.1小时
- 虫号: 1182357
- 注册: 2011-01-03
- 性别: GG
- 专业: 数论
2楼2017-02-17 21:17:49
snowwhite1
木虫 (小有名气)
- 应助: 5 (幼儿园)
- 金币: 4484.2
- 帖子: 275
- 在线: 104.1小时
- 虫号: 1182357
- 注册: 2011-01-03
- 性别: GG
- 专业: 数论
3楼2017-02-17 21:18:44
erictan2046
铜虫 (正式写手)
- 应助: 0 (幼儿园)
- 金币: 170.8
- 散金: 22
- 红花: 2
- 帖子: 387
- 在线: 43.4小时
- 虫号: 577082
- 注册: 2008-06-22
- 性别: GG
- 专业: 生物化学与分子生物学
4楼2017-02-18 21:48:01