-16又3分之1-【5又4分之1+(-2又7分之2)-5.25-3又7分之5]=-49/3-(21/4-16/7-21/4-26/3)=-49/3-(-16/7-26/3)=-49/3+26/3+16/7=-23/3+16/7=-161/21+48/21=-113/21