.

'. 3 实用的平方根表立方根表

平方表 立方表 平方根 立方根

12=1 13=1 √1＝1 √1 = 1

22＝4 23=8 √2＝1.414 √2 = 1.260

32＝9 33＝27 √3＝1.732 √3 = 1.442

42＝16 43＝64 √4＝2 √4 = 1.587

52＝25 53＝125 √5＝2.236 √5 = 1.710

62＝36 63＝216 √6＝2.449 √6 = 1.817

72＝49 73＝343 √7＝2.646 √7 = 1.913

82＝64 83＝512 √8＝2.828 √8 = 2

92＝81 93＝729 √9＝3 √9 = 2.080

102＝100 103＝1000 √10＝3.162 √10 = 2.154

112＝121 113＝1331 √11 = 3.317 √11 = 2.224

122＝144 123＝1728 √12 = 3.464 √12 = 2.289

132＝169 133＝2197 √13 = 3.606 √13 = 2.351

142＝196 143＝2744 √14 = 3.742 √14 = 2.410

152＝225 153＝3375 √15 = 3.873 √15 = 2.466

162＝256 163＝4096 √16 = 4 √16 = 2.520

172＝289 173＝4913 √17 = 4.123 √17 = 2.571

182＝324 183＝5832 √18 = 4.243 √18 = 2.621

192＝361 193＝6859 √19 = 4.359 √19 = 2.668

202＝400 203＝8000 √20 = 4.472 √20 = 2.714 .

'.

√0 = 0（表示根号0等于0，下

平方根表立方根表

√1 = 1

√2 = 1.414

√3 = 1.732

√4 = 2

√5 = 2.236

√6 = 2.449

√7 = 2.646

√8 = 2.828

√9 = 3

√10 = 3.162

√11 = 3.317

√12 = 3.464

√13 = 3.606

√14 = 3.742

√15 = 3.873

√16 = 4

√17 = 4.123

√18 = 4.243

√19 = 4.359

√20 = 4.472

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