Question

cate nr. de forma abc (cu bara deasupra) . cu b=3, indeplinesc conditia abc-cba=297?

Answer 1

100a+10b+c-100c-10b-a=297
99a-99c=297
a-c=3
a=3+c
a>0
c>0
a={4,5,6,7,8,9}
c={1,2,3,4,5,6}
b=3 din enuntul problemei
nr sunt 431,532,633,734,835,936