積分(1)の1．(3)の解答

$3$\displaystyle{ \int \frac{\hspace{2}3\hspace{2}}{\hspace{2} {x}^{5} \hspace{2}} dx }$
$3$\displaystyle{\begin{array}{lll}=& 3\int {x}^{ - 5 }dx & \vspace{6}\\ =& 3\cdot \frac{\hspace{2}1\hspace{2}}{\hspace{2} - 4 \hspace{2}}{x}^{ - 4 }+C & \vspace{6}\\ =& - \frac{\hspace{2}3\hspace{2}}{\hspace{2} 4{x}^{4} \hspace{2}}+C & \vspace{6}\\ \end{array}}$
　 $3$C$ は積分定数

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