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$\left(\dfrac{x^{m}}{x^{n}}\right)^{m+n} \cdot\left(\dfrac{x^{n}}{x^{l}}\right)^{n+l}\cdot\left(\dfrac{x^{l}}{x^{n}}\right)^{l+m}$ = ....

1
-1
$x^{m+n+l}$
$\frac{1}{x^{m+n+l}}$
Explanation:

$\dfrac{x^{m^{2}}\times x^{mn}}{x^{nm}\times x^{n^{2}}}\times \dfrac{x^{n^{2}\times x^{ln}}}{x^{ln}\times x^{l^{2}}}\times \dfrac{x^{l^{2}}\times x^{lm} }{x^{lm}\times x^{m^{2}} }=1$

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