kak no 5 sama 6 itu gimana y..

5.

[tex] = {a}^{ - 6 + 2} {b}^{4 - 2} \\ = {a}^{ - 4} {b}^{2} [/tex]

6.
= 4×2 {m}^{7-6} {n}^{-4-3}
= 8{m}^{1} {n}^{-7}