12⁶ : 3⁶ : 4⁴ =
= 3⁶·4⁶ : 3⁶ : 4⁴
= 3⁶: 3⁶ · 4⁶ : 4⁴
= 1 · 4⁶⁻⁴
= 1 · 4²
= 16
12^6÷3^6÷4^4 =
= (12÷3)^6÷4^4
= 4^6÷4^4
= 4^2 = 4•4