微分(2)の1．(5)の解答

$3$\displaystyle{y=3{x}^{2}+\frac{\hspace{2}2\hspace{2}}{\hspace{2} {x}^{2} \hspace{2}}+7}$
$3$\displaystyle{ \begin{array}{lll}{y}^{\prime }&=& { $ 3{x}^{2} $ }^{\prime }+{ $ \frac{\hspace{2}2\hspace{2}}{\hspace{2} {x}^{2} \hspace{2}} $ }^{\prime }+{7}^{\prime } & \vspace{6}\\ &=& 3{ $ {x}^{2} $ }^{\prime }+2{ $ {x}^{ - 2 } $ }^{\prime } & \vspace{6}\\ &=& 3\cdot 2x+2\cdot $ - 2 $ {x}^{ - 3 } & \vspace{6}\\ &=& 6x- \frac{\hspace{2}4\hspace{2}}{\hspace{2} {x}^{3} \hspace{2}} & \vspace{6}\\ \end{array} }$
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