$$\frac{ 3 }{ 2ab } \times \frac{ 4 }{ 3ab }$$
$\frac{2}{\left(ab\right)^{2}}$
$$\frac{3\times 4}{2ab\times 3ab}$$
$$\frac{2}{aabb}$$
$$\frac{2}{a^{2}bb}$$
$$\frac{2}{a^{2}b^{2}}$$
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$-\frac{4}{b^{2}a^{3}}$
