简便计算119.75+299.75+399.75+499.75+1
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简便计算119.75+299.75+399.75+499.75+1
简便计算119.75+299.75+399.75+499.75+1
简便计算119.75+299.75+399.75+499.75+1
119.75+299.75+399.75+499.75+1
=120-0.25+300-0.25+400-0.25+500-0.25+1
=120+300+400+500-0.25*4+1
=1320
1320
119.75+299.75+399.75+499.75+1=119.75+299.75+399.75+499.75+(0.25+0.25+0.25+0.25)=(119.75+0.25)+(299.75+0.25)+(399.75+0.25)+(499.75+0.25)=120+300+400+500=1320