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3. Determina toate numerele naturale care impartite la 5 dau catul 13.


Răspuns :

X : 5 = 13 r R => R<5 =>
1) R=0 => X : 5 = 13 r 0 => X=13 x 5 + 0 = 65
2)R=1 => X : 5 = 13 r 1 => X=13 x 5 +1 = 66
3)R=2 => X : 5 = 13 r 2 => X=13 x 5 + 2= 67
4)R=3 => X : 5 = 13 r 3 => X=13 x 5 + 3= 68
5)R=4 => X : 5 = 13 r 4 => X=13 x 5 + 4 =69