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

${\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： 2023年11月28日