Resposta :
a) 6 x 6 x 6 x 6 = 6⁴
6 x 6 x 6 x 6
36 x 6 x 6
216 x 6
1296
b) 9 x 9 = 9²
9 x 9
81
c) 7 x 7 x 7 x 7 x 7 x 7 x 7 x 7 = 7⁸ | ⁸ = 8
7 x 7 x 7 x 7 x 7 x 7 x 7 x 7
49 x 7 x 7 x 7 x 7 x 7 x 7
343 x 7 x 7 x 7 x 7 x 7
2401 x 7 x 7 x 7 x 7
16807 x 7 x 7 x 7
117649 x 7 x 7
823543 x 7
5764801
Espero ter ajudado!