0.75+(-4/11)+0.125+(-7/5)+(-4又8分之一)+0.25 =3/4-4/11+1/8-7/5-33/8+1/4=3/4+1/4+1/8-33/8-4/11-7/5=1-4-4/11-7/5=-3-4/11-1-1/5=-4-4/11-1/5=-4-(20+11)/55=-4-31/55=-4又31/55