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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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erictan2046
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13楼2017-02-19 15:45:30
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
