急!数学题,给30分!!!
(-47.65)*2又6/11+(-37.15)*(-2又6/11)+10.5*(-7又5/11)简便计算...
(-47.65)*2又6/11+(-37.15)*(-2又6/11)+10.5*(-7又5/11)
简便计算 展开
简便计算 展开
2个回答
2010-10-06
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(-47.65)*2又6/11+(-37.15)*(-2又6/11)+10.5*(-7又5/11)
=(-47.65)*2又6/11+(37.15)*(2又6/11)+10.5*(-7又5/11)
=(-47.65+37.15)*(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
=(-47.65)*2又6/11+(37.15)*(2又6/11)+10.5*(-7又5/11)
=(-47.65+37.15)*(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
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