bonjour
15³ = (3 x 5)³ = 3³ x 5³
1/15³ + 1/5³ = 1 /15³ + (1 x 3³/(5³ x 3³)
= 1/15³ + 3³/(5 x 3)³
= 1/15³ + 3³/15³
= 1/15³ + 27/15³
= (1 + 27)/15³
= 28/15³
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bonjour
15³ = (3 x 5)³ = 3³ x 5³
1/15³ + 1/5³ = 1 /15³ + (1 x 3³/(5³ x 3³)
= 1/15³ + 3³/(5 x 3)³
= 1/15³ + 3³/15³
= 1/15³ + 27/15³
= (1 + 27)/15³
= 28/15³