There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ x(25 - 2x)(20 - x)\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = - 65x^{2} + 2x^{3} + 500x\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( - 65x^{2} + 2x^{3} + 500x\right)}{dx}\\=& - 65*2x + 2*3x^{2} + 500\\=& - 130x + 6x^{2} + 500\\ \end{split}\end{equation} \]

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