Question

care nr. de forma abc, cu b=3, indeplinesc conditia abc-cba=297

Answer 1

consideram a diferit de b diferit de c
100a+10b+c-100c-10b-a=297
99a-99c=297
99(a-c)=297
a-c=3      a=3+c
a={4,5,7,8,9}
c={1,2,4,5,6}
431-134=297
532-235=297
734-437=297
835-538=297
936-639=297