Răspuns:
111
Explicație pas cu pas:
(abc+cab+bca):(a+b+c) = ( 100a+10b+c+100c+10a+b+100b+10c+1):(a+b+c)=(111a+111b+111c):(a+b+c)=111(a+b+c):(a+b+c)=111
100 a+ 10b+ c + 100b +10c+a + 100c+10a +b / (a+b+c)
(111 a+111b+111c ) / a+b+c = 111( a+b+c ) / a+b+c = 111
