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Daca a si b sunt cifre in baza 10 si 41 / 2ab+ab, atunci ab apatiine multimii ....

varianta A) {23,64} B) {23,62} C) {22,64} sau D {22,62}

Răspuns :

Mikkka
2ab +ab ∈ M41
200 + ab+ab ∈ {0,41,82,123, 164, 205, 246, 287, 328,369, 410..}
200 + 2* ab= 246⇒ 2*ab= 246-200⇒ 2*ab= 46⇒ ab= 46:2⇒ ab=23
200+ 2*ab= 328⇒ 2*ab= 328-200⇒ 2*ab= 128 ⇒ ab=128:2⇒ ab=64
ab ∈ {23,64} A

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