作业帮2.61*39.5+0.318*261+2.87*26.1怎样简便计算
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2.61*39.5+0.318*261+2.87*26.1怎样简便计算
2.61*39.5+0.318*261+2.87*26.1怎样简便计算
2.61*39.5+0.318*261+2.87*26.1怎样简便计算
2.61*39.5+0.318*261+2.87*26.1=2.61*39.5+31.8*2.61+28.7*2.61
=2.61*(39.5+31.8+28.7)=2.61*100=261
2.61*39.5+0.318*261+2.87*26.1=2.61*39.5+31.8*2.61+28.7*2.61
=2.61*(39.5+31.8+28.7)=2.61*100=261
2.61*39.5+0.318*261+2.87*26.1
=0.261*395+0.381*261+287*0.261
=(395+0.381+287)*0.261
=(712+287)*0.261
=1000*0.261
=2610
我是这样写的