2.31×1.6×0.5×1.25.怎样简便计算

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2.31×1.6×0.5×1.25.怎样简便计算2.31×1.6×0.5×1.25.怎样简便计算2.31×1.6×0.5×1.25.怎样简便计算小数点后移2.31*2*0.5*0.8**1.252.3

2.31×1.6×0.5×1.25.怎样简便计算
2.31×1.6×0.5×1.25.怎样简便计算

2.31×1.6×0.5×1.25.怎样简便计算
小数点后移

2.31*2*0.5*0.8**1.25
2.31

不对,应该是1.6写成4*0.4利用1.25*4=5
0.5*0.4=0.2
0.2*5=1

2.31*1.6*0.5*1.25
=1.6*0.5*1.25*2.31
=0.8*1.25*2.31
=1*2.31
=2.31

1.6x0.5=0.8×1,25=1x2.31=2.31