5-11/12-11/18+7/12-1/18+29/6=5-11/12+7/12-11/18-1/18+29/6=5-(11/12-7/12)-(11/18+1/18)+29/6=5-4/12-12/18+29/6=5-(1/3+2/3)+29/6=5-1+29/6=4+4又5/6=8又5/6
