0.9*8.1+0.81简便算法怎么算

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0.9*8.1+0.81简便算法怎么算0.9*8.1+0.81简便算法怎么算0.9*8.1+0.81简便算法怎么算0.9*8.1+0.81=0.9*8.1+0.1*8.1=8.1*(0.9+0.1)=

0.9*8.1+0.81简便算法怎么算
0.9*8.1+0.81简便算法怎么算

0.9*8.1+0.81简便算法怎么算
0.9*8.1+0.81
=0.9*8.1+0.1*8.1
=8.1*(0.9+0.1)
=8.1

0.9×8.1+0.81
=9×0.81+0.81
=0.81×(9+1)
=0.81×10
=8.1