0.9*8.1+0.81简便算法怎么算
问题描述:
0.9*8.1+0.81简便算法怎么算
答
0.9×8.1+0.81
=9×0.81+0.81
=0.81×(9+1)
=0.81×10
=8.1
答
0.9*8.1+0.81
=0.9*8.1+0.1*8.1
=8.1*(0.9+0.1)
=8.1