There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (865*1.25 + 311 + 0.012*21000 + 865*1.5(1.36 - 0.01x))(1 + 0.92*0.02x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = 19.895x + 5.7224x + 4.6368x + 32.46864x - 12.975x - 0.23874x^{2} + 3408.85\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( 19.895x + 5.7224x + 4.6368x + 32.46864x - 12.975x - 0.23874x^{2} + 3408.85\right)}{dx}\\=&19.895 + 5.7224 + 4.6368 + 32.46864 - 12.975 - 0.23874*2x + 0\\=& - 0.47748x + 49.74784\\ \end{split}\end{equation} \]

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