There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ (7{x}^{2}){\frac{1}{({x}^{2} + x)}}^{3}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{7x^{2}}{(x^{2} + x)^{3}}\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{7x^{2}}{(x^{2} + x)^{3}}\right)}{dx}\\=&7(\frac{-3(2x + 1)}{(x^{2} + x)^{4}})x^{2} + \frac{7*2x}{(x^{2} + x)^{3}}\\=&\frac{-42x^{3}}{(x^{2} + x)^{4}} - \frac{21x^{2}}{(x^{2} + x)^{4}} + \frac{14x}{(x^{2} + x)^{3}}\\ \end{split}\end{equation} \]

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