高中數學和歷史的問題(急) - 生活
By Regina
at 2010-06-30T00:00
at 2010-06-30T00:00
Table of Contents
我是7/27/3要考指考的同學做了歷史模考後有些問題來不及問完老師然後今天朋友問了我一題數學我不會所以有點緊張:P想說上來問問知識+雖然這不一定會考,但了解總比較心安囉以下是我的問題:1.f(x)=3+3^x+3^(4-x)也就是3+3的x次方+3的4-x次方求x=_____時,f(x)有min_____我的算法是設3^x=t>0所以f(x)=3+t+81/t=t^2+3t+
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