$$( 1 ) : a \cdot \frac { 3 } { \sqrt { 8 + 1 } }$$
$\frac{1}{a}$
$$\frac{1}{a}\times \frac{3}{\sqrt{9}}$$
$$\frac{1}{a}\times \frac{3}{3}$$
$$\frac{1}{a}\times 1$$
$$\frac{1}{a}$$
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$-\frac{1}{a^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{1}{a}\times \frac{3}{\sqrt{9}})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{1}{a}\times \frac{3}{3})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{1}{a}\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{1}{a})$$
$$-a^{-1-1}$$
$$-a^{-2}$$
