abc+bca+cab=555. abc=100a + 10b+ c bca= 100b+10c+a cab=100c+10a+b Deci: 100a + 10b+ c+100b+10c+a+100c+10a+b= 555 111a+111b+111c= 555 111(a+b+c)=555 a+b+c=555:111 a+b+c=5. Cazul 1: a=1,b=0,c=4 Deci 104. sau 140. Cazul 2: a=3,b=2,c=0. Deci 320 sau 302 sau 230 sau 203. Cazul 3: a=5,b=0,c=0. Deci 500.