0.85-(-0.75)-(+2又3/4)+(-1.85)+(+3)

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0.85-(-0.75)-(+2又3/4)+(-1.85)+(+3)

0.85-(-0.75)-(+2又3/4)+(-1.85)+(+3)
0.85-(-0.75)-(+2又3/4)+(-1.85)+(+3)

0.85-(-0.75)-(+2又3/4)+(-1.85)+(+3)
0.85-(-0.75)-(+2又3/4)+(-1.85)+(+3)
=(0.85-1.85)+(0.75-2又3/4)+3
=-1-2+3
=0