There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ \frac{(0.1 + \frac{x}{(x + 0.31)} + 0.206)}{3}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{0.333333333333333x}{(x + 0.31)} + 0.102\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{0.333333333333333x}{(x + 0.31)} + 0.102\right)}{dx}\\=&0.333333333333333(\frac{-(1 + 0)}{(x + 0.31)^{2}})x + \frac{0.333333333333333}{(x + 0.31)} + 0\\=&\frac{-0.3333333333333x}{(x + 0.31)(x + 0.31)} + \frac{0.333333333333333}{(x + 0.31)}\\ \end{split}\end{equation} \]

Your problem has not been solved here? Please take a look at the  hot problems ！