$$a ^ { 5 } \div 9 ^ { 3 }$$
$\frac{5a^{4}}{729}$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{a^{5}}{729})$$
$$5\times \frac{1}{729}a^{5-1}$$
$$\frac{5}{729}a^{5-1}$$
$$\frac{5}{729}a^{4}$$
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$\frac{a^{5}}{729}$
$$\frac{a^{5}}{729}$$
