[請益] 104台大商研第七題
想請問一下這題
http://i.imgur.com/VUXWaY2.jpg



在一開始列式時就有基本的不一樣
但不管如何就是要幫廠商利潤極大
且A,B兩城市無套利的空間
結果為什麼我算出來的利潤比楊莉的答案大
且各種產量跟價格代進去都合乎式子
且這個答案兩城市也無法有套利空間
為什麼><
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