ABC和A1B1C1中,AB/A1B1*BC/B1C1=AC/A1C1=3/5,AB+AC+BC=16.5m,A1+B1+C1=?是不是：AB/A1B1＝BC/B1C1=AC/A1C1=3/5,AB+AC+BC=16.5m,A1B1+B1C1+C1A1=?A1B1+B1C1+C1A1＝5AB/3+5BC/3+5AC/3＝5（AB+BC+AC）/3＝5×16.5/3＝27...