$$\frac{ 3 }{ x } \frac{ 4 }{ y } \frac{ 5 }{ z } =$$
$\frac{60}{xyz}$
$$\frac{3\times 4}{xy}\times \frac{5}{z}$$
$$\frac{3\times 4\times 5}{xyz}$$
$$\frac{12\times 5}{xyz}$$
$$\frac{60}{xyz}$$
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$-\frac{60}{yzx^{2}}$
