题目内容：

99.9+O.2+0.9+9.9+0.2+999.9
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优质解答

99.9+0.2+0.9+9.9+0.2+999.9
=(99.9+0.1)+(0.1+0.9)+(9.9+0.1)+(0.1+999.9)
=100+1+10+1000
=1111