（-2又3/4）+1又2/3+0.75+（+1/8）+（-3.125）
=-2-3/4+1+2/3+3/4+1/8-3-1/8
=-2+1+2/3-3
=-4+2/3
=-10/3
=-3又1/3
计算：（-2又3/4）+1又2/3+0.75+（+1/8）+（-3.125）
计算：（-2又3/4）+1又2/3+0.75+（+1/8）+（-3.125）
数学人气：242 ℃时间：2020-01-31 13:27:30
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