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问题: 初一巧算

(-57.65)*2又6/11+(-47.15)*(-2又6/11)+10.5*(-7又5/11)

解答:

(-57.65)*2又6/11+(-47.15)*(-2又6/11)+10.5*(-7又5/11)=
[(-57.65)*2又6/11+(47.15*2又6/11)]+10.5*(-7又5/11)=
[(-57.65)+(47.15)]*2又6/11+10.5*(-7又5/11)=
(-10.5)*(2又6/11)+10.5*(-7又5/11)=
-10.5*[(2又6/11)+(+7又5/11)]=
-10.5*10=
-105