常用対数表(1，2，･･･，10)

上記の表では小数点以下4桁で表示

対数計算の基本(4，5)から，次の値がもとまる．

${\displaystyle {log}_{10}1}$ ${\displaystyle =0}$

${\displaystyle {log}_{10}10}$ ${\displaystyle =1}$

そして， ${\displaystyle {log}_{10}2}$ ， ${\displaystyle {log}_{10}3}$ ， ${\displaystyle {log}_{10}7}$ の値が分かれば，残りの値を求めることができる．

対数計算の基本(1，2，3)を参考に計算する．

${\displaystyle {log}_{10}4}$ ${\displaystyle ={log}_{10}{2}^2}$ ${\displaystyle =2{log}_{10}2}$

${\displaystyle {log}_{10}5}$ ${\displaystyle ={log}_{10}\frac{10}{2}}$ ${\displaystyle ={log}_{10}10-{log}_{10}2}$ ${\displaystyle =1-{log}_{10}2}$

${\displaystyle {log}_{10}6}$ ${\displaystyle ={log}_{10}\left(2\times 3\right)}$ ${\displaystyle ={log}_{10}2+{log}_{10}3}$

${\displaystyle {log}_{10}8}$ ${\displaystyle ={log}_{10}{2}^3}$ ${\displaystyle =3{log}_{10}2}$

${\displaystyle {log}_{10}9}$ ${\displaystyle ={log}_{10}{3}^2}$ ${\displaystyle =2{log}_{10}3}$

後は， ${\displaystyle {log}_{10}2}$ ， ${\displaystyle {log}_{10}3}$ の値を代入すれば，それぞれの値が分かる．

　

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作成：学生スタッフ

最終更新日： 2025年6月24日