将军饮马问题
lovelycheung2022-10-04 11:39:541条回答
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- 实力决非偶然 共回答了13个问题
|采纳率69.2% - 很高兴为你解答.
河流为l,将军出发地为A,目的地为B
做A的对称点A',连接A'和B
A'B和l 的交点O就是将军饮马的最佳地点,
为什么这是最短路程呢?
我们知道,两点之间,线段最短.
因为l是AA’的垂直平分线,则AO=A'O.
也就是说,A'和B的最短路程其实就是等于AO+BO.
那么将军的路线就是AO----BO. - 1年前
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Soon after the war the general returned to Washington.One day he went to a dentist and asking him to pull his six teeth.A week later his teeth were being sold in curiosity(古玩)shops at $5 each.On each of the teeth there was a label(标签)with the name of the general and words:”Buy these teeth and show them to your friends at home”.The general got angry.He rushed to his office and ordered(命令)six offices to go around the city and buy all his teeth.
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( )2.What did many people wish to do?
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