$$( \frac { a } { a } ) ^ { 2 } \cdot ( \frac { a } { a } ) ^ { 2 } \cdot ( \frac { 3 } { a } ) ^ { 3 }$$
$\frac{27}{a^{3}}$
$$1^{2}\times \left(\frac{a}{a}\right)^{2}\times \left(\frac{3}{a}\right)^{3}$$
$$1^{2}\times 1^{2}\times \left(\frac{3}{a}\right)^{3}$$
$$1^{4}\times \left(\frac{3}{a}\right)^{3}$$
$$1\times \left(\frac{3}{a}\right)^{3}$$
$$1\times \frac{3^{3}}{a^{3}}$$
$$\frac{3^{3}}{a^{3}}$$
$$\frac{27}{a^{3}}$$
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