中科新闻网佳能打鸟相机:嘿嘿。。还有一道幂函数的题。。麻烦你们了。。也是英文的。
来源：百度文库 编辑：中科新闻网 时间：2024/04/30 00:11:21
Two variable x and y are related by the equation y=ln(2+e^-x)for x>0. Given that x is increasing at the rate of 3unit/s, find, in terms of e,the rate of the change of y when x=1.
求导数。
y'=1/(2+e^(-x))*(-e^(-x))*x'
x=1时y'=3/(2*e+1)