解:7/8-(11/16-2/3)=7/8-11/16+2/3=14/16-11/16+2/3=3/16+2/3=9/48+32/48=41/48
7/8-11/16+2/3=14/16 -11/16+2/3=3/16+2/3=9/48+32/48=41/48