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1、资料分析中常用的数学常数“多位特殊小数”及其对应分数33.3%=0.333 166.7%=0.66733225.0%=0.250 =1416.7%=0.1671614.3%=0.1431742.9%=0.4293771.4%=0.7145712.5%=0.125 =1862.5%=0.625 =5811.1%=0.1111944.4%=0.4444977.8%=0.778799.1%=0.0911117.7%=0.07711375.0%=0.750 =83.3%=0.8335628.6%=0.2862757.5%=0.5754785.7%=0.8576737.5%=0.375 =87.5%=0
2、.875 =22.2%=0.2222955.6%=0.5565988.9%=0.889898.3%=0.0831217.1%=0.071 1143438786.7%=0.0676.25%=0.0625=116特殊分数的记忆方式1151=0.1428572 =0.2 85714 , 3 =0.4 2857 1 , 4 =0. 57142 8 ,77775 =0. 714285 , 6 =0.8 57142771=0.12，4，5，7，8；9999991=0.092 ，3，4，5，6 ，7 ，8，9， 1011111111111111111111无限不循环小数2 1.4141.414 1.4142；3 1.7321.7321.73235 2.2362.2362.2365； 6 2.4492.4492.44967 2.6462.646 2.6467；8 2.8282.8282.828810 3.1623.1623.1621011 30 的平方数11 2 =12112 2 =14413 2=16914 2=19615 2 =22516 2 =25617 2 =28918 2=32419 2=36120 2 =40021 2 =44122 2 =48423 2=52924 2=57625 2 =62526 2 =67627 2 =72928 2=78429 2=84130 2 =900