99.9+O.2+0.9+9.9+0.2+999.9======_数学解答

99.9+O.2+0.9+9.9+0.2+999.9
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人气：365 ℃　时间：2020-04-16 21:47:39

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