Question

determinati toate numerele scrise in baza 10 de forma ab care sunt cu 36 mai mari decat ba

Answer 1

ab=10a+b
ba=10b+a
10a+b=10b+a+36
9a-9b=36
a-b=4
a ∈ { 5,6,7,8,9}
b ∈ { 1,2,3,4,5}
ab ∈ { 51,62,73,84,95}