There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (100 - y)*2(x + 500) - (\frac{1}{10}x + 1)(x + 500) + 5(100 - y)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 149x - 2yx - 1005y - \frac{1}{10}x^{2} + 100000\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 149x - 2yx - 1005y - \frac{1}{10}x^{2} + 100000\right)}{dx}\\=&149 - 2y + 0 - \frac{1}{10}*2x + 0\\=& - 2y - \frac{x}{5} + 149\\ \end{split}\end{equation} \]

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