6^-4 = 1/$6^4$ = 1/$1296$ = 1/1296
2^-6 = 1/$2^6$ = 1/64
3^-4 = 1/$3^4$ = 1/81

6^-4 : $2^{-}6<em>3^{-}4$ = 1/1296 : $1/64</em>1/81$ = 1/1296 : $1/5184$ = 1/1296 * 5184 = 4

3^-2 = 1/$3^2$ = 1/9
5^-3 = 1/$5^3$ = 1/125

3^-2 5^-3 = $1/9$ $1/125$ = 1/1125

15^-3 = 1/$15^3$ = 1/3375

3^-2 5^-3 : 15^-3 = $1/1125$ : $1/3375$ = 1/1125 3375 = 3