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國二數學請詳解

Apr 29th 2014, 14:41

我們將圖中直線視為一條河，A、B兩地在河的同一側，

A地每天有貨物要經河港運出，B地每天要由河港補充日常所需物，

家誠每天開車負責從A地運貨到河港，再從河港將B地所需物載到B

地，請幫家誠設計河港的建設位置，使他可以用最短的路程完成工作。

(在直線上找出一點P，使線PA+線PB最短)
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