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](/uploads/image/z/172875-3-5.jpg?t=2.61%2A39.5%2B0.318%2A261%2B2.87%2A26.1%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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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