来自刘超彬的问题
把0.5•8•50.5•80.580.5850.588从小到大排列．0.58＜0.585＜0.5•8•5＜0.588＜0.5•8．0.58＜0.585＜0.5•8•5＜0.588＜0.5•8．．
把0.5•8•5 0.5•8 0.58 0.585 0.588从小到大排列．
0.58＜0.585＜0.5•8•5＜0.588＜0.5•8．
0.58＜0.585＜0.5•8•5＜0.588＜0.5•8．
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