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va rog ajutatima
urgent


Va Rog Ajutatima Urgent class=

Răspuns :

d = 9·c + c + 1 = 10c + 1 
  r ∈ {1,2,3,4,5,6,7,8} ⇒ c ∈ {0,1,2,3,4,5,6,7}
d = 10c +1  ⇒ d ∈ {,11,21,31,41,51,61,71}
numerele sunt:
11,21,31,41,51,61,71