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erictan2046铜虫 (正式写手)
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[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。
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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  |
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snowwhite1
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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
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2楼2017-02-17 21:17:49
snowwhite1
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3楼2017-02-17 21:18:44
erictan2046
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4楼2017-02-18 21:48:01