$$\frac{ { a }^{ 2 } b }{ a { b }^{ 2 } }$$
$\frac{a}{b}$
$$\frac{a^{2}b^{1}}{a^{1}b^{2}}$$
$$a^{2-1}b^{1-2}$$
$$a^{1}b^{1-2}$$
$$a^{1}\times \frac{1}{b}$$
$$a\times \frac{1}{b}$$
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$-\frac{a}{b^{2}}$