Răspuns :
ab → numar natural de doua cifre, cu a≠0
b=a-2⇒a ≥ 2
a=(9, 8, 7, 6, 5, 4, 3, 2)⇒ b=( 7, 6, 5, 4, 3, 2, 1, 0)
Asadar numerele de forma ab sunt: 97, 86, 75, 64, 53, 42, 32, 20
b=a-2⇒a ≥ 2
a=(9, 8, 7, 6, 5, 4, 3, 2)⇒ b=( 7, 6, 5, 4, 3, 2, 1, 0)
Asadar numerele de forma ab sunt: 97, 86, 75, 64, 53, 42, 32, 20