阿摩線上測驗
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阿摩線上測驗
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3. (10 pts) Let x＞0 and △ABC be a triangle whose side lengths are 
. Choose a point P on 
, and a point Q on 
, and a point R on 
so that
Let f(x) be the area of △PQR . Find the critical point and the minimum of f(x).