1.9*4.5+0.45用简便算法该怎样写

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1.9*4.5+0.45用简便算法该怎样写
1.9*4.5+0.45用简便算法该怎样写

1.9*4.5+0.45用简便算法该怎样写
1.9*4.5+0.45
=1.9*4.5+0.1*4.5
=(1.9+0.1)*4.5
=2*4.5
=9

1.9*4.5+0.45
=1.9*4.5+0.1*4.5
=(1.9+0.1)*4.5
=2*4.5
=9

1.9*4.5+0.45
=1.9*4.5+1*4.5
=1.9*4.5+0.1*4.5
=(1.9+0.1)*4.5
=2*4.5
=9
我这个更详细

1.9*4.5+0.45
=1.9*4.5+0.1*4.5
=(1.9+0.1)*4.5
=2*4.5
=9

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