Resposta:

a) 32/243

b)8/27

c)9/25

Explicação passo-a-passo:

(2/3)⁴.(2/3)¹=

16/81 . 2/3=

32/243

16 2

. = 32/243

81 3

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(2/3)⁵ : (2/3)²=

32/243 : 4/9=

8/27

32 4

----- : = 8/27

243 9

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(3/5)²= 9/25

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Bons estudos :)