[課業] 經濟學隱函數
小弟作經濟學考古題卡關請大家幫幫忙
http://i.imgur.com/iJZDh8g.jpg
如圖
u=xy+2x 微分x得y+2 這邊ok
微分y得x 這就不懂了 = =
後來差了一下這叫隱函數
看了網路上的公式帶進去也不等於x啊
請微積分高手幫忙指點
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