(-2又17/37)-[(+3又3/74)+(-5.5)]-(+2.25) =-(2+17/37)-(3+3/74)+5.5-2.25 =-2-34/74-3-3/74+5.5-2.25 =(5.5-2-3-2.25)-(34/74+3/74) =-1.75-37/74 =-1.75-0.5 =-2.25
