(i)

⇒ (LCM of 3 and 4 is 12) [Using ^-n = ]

(ii)

⇒ (LCM of 1 and 4 is 4) [Using ^-n = ]

(iii)

⇒ [Using ]

We know that any number to power zero is always equal to 1.

(iv)

⇒ [Using ^-n = ]