Explicação passo a passo:

multiplica os numeradores e multiplica os denominadores

a)

(5/7)² = 5/7 * 5/7 = 25/49 >>>

b)

(1/6)³ = 1/6 * 1/6 * 1/6 = 1/216 >>>

c)

(2/4)⁵= 2/4 * 2/4 * 2/4 * 2/4 * 2/4 =32/1024 >>>>

d)

(3/4)²= 3/4 * 3/4 = 9/16

e) 6/2²

( 6/2)² = 6/2 * 6/2 = 36/4 ****

ou

6/2^2 idem acima

f)

4/6⁵

( 4/6)^5 = 4/6 * 4/6 * 4/6 * 4/6 *4/6 =1024/776

ou

4/6^2 idem acima