There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (50 - x)(1 + \frac{(50 + 8x)}{100})\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{5}{2}x - \frac{2}{25}x^{2} + 75\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{5}{2}x - \frac{2}{25}x^{2} + 75\right)}{dx}\\=&\frac{5}{2} - \frac{2}{25}*2x + 0\\=& - \frac{4x}{25} + \frac{5}{2}\\ \end{split}\end{equation} \]

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