1.9+1.99+1.999简便计算求= =

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1.9+1.99+1.999简便计算求= =

1.9+1.99+1.999简便计算求= =
1.9+1.99+1.999简便计算
求= =

1.9+1.99+1.999简便计算求= =
=2-0.1+2-0.01+2-0.001=6-0.111=5.889