1) 12,918-(4,918+3,4)=(12,918-4,918)-3,4=8-3,4=4,6
2) (6,403+8,715)-2,403=(6,403-2,403)+8,715=4+8,715=12,715
1) 12,918-(4,918+3,4)=(12,918-4,918)-3,4=8-3,4=4,6
2) (6,403+8,715)-2,403=(6,403-2,403)+8,715=4+8,715=12,715