5) b³/с³=bc
6) x³*(x⁴)³=x³*x¹²=x14
7) a⁶/a⁷
8) 9 a⁶ b¹°
10)1234, 1243, 1342, 1324,1432,1423;
2134, 2341, 2143, 2314, 2413, 2431;
3124,3142, 3241,3214,3412,3421;
4321, 4312
4123, 4132, 4231, 4213
12)10(²(n-1))=10000
10(²(n-1))=10^4
2(n-1)=4
n-1=2
n=3
14)55⁸ = (5*11)⁸ = 5⁸* 11⁸
11¹⁶ = 11(⁸*²) = (11⁸)²
55⁸ / 11¹⁶ = 5⁸ * 11⁸ / (11⁸)²= 5⁸/ 11⁸ = (5/11)⁸ < 1 => 55⁸ < 11¹⁶