1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991 简便算法

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1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991 简便算法
1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991 简便算法

1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991 简便算法
1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991
=(1000.9+999.1)+(99.91+100.09)+10.009+(1.0009+0.9991)
=2000+200+10.009 +2
=2212.009

2222

1000.9+999.1+99.91+100.09+10.009+1.0009+0.9991
=(1000.9+999.1)+(99.91+100.09)+10.009+(1.0009+0.9991)
=2000+200+10.009 +2
=2212.009
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