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[5,(4)] la 18 :(49\9) la 17=

Răspuns :

5,(4) = 5 4/9 = 49/9 ;
(49/9)^18 ÷ (49/9)^17 = 49/9.
Bafta !
[49/9]¹⁸ /[49/9]¹⁷
⇒[49/9]₁=49/9=5,[4];