1.=5.2+4.8-2又六分之一+4又六分之五=10-7=32.=-9.2+7.4+9.2-0.4-4+3=7.4-0.4-1=63.=-728/17+-4/3*-1/4=-728/17+1/3=-2167/514.=-3.61*0.75+0.61*0.75+0.2*0.75=0.75*-3.61+0.61+0.2=0.75*3.2=四分之三*3.2=2.45.=5/6-2/3+4/7-5/14-1/42=1/6+3/14-1/42=7/42+9/42-1/42=16/42*-1/42=-4/4416.=-12*-1/3-1/6+2/5-3/10=-12*-1/2+1/10=-12*-0.4=4.87.=-2.5/-10*-10/3/-5/12=-2.5*12/3*-5=0.5*4=28.=-9-3+1/2-2/3*12-9=-21-2=-239.=-1--7/2=-1+3.5=2.510.=-5^2+8*9+6/1/9=25+72+54=151貌似第三题抄错了吧。