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第三章 指數與對數

第三章 指數與對數. 3 - 5  常用對數. 3-5  常用對數. 1. 常用對數 2. 對數表 3. 首數與尾數 4. 首數與尾數的應用. 常用對數. (1) 以 10 為底數的對數,稱為常用對數。 (2) 通常把常用對數的底數 10 省略不寫, 即 。 例如:. 查對數表 , 求 log2.14 =? 在最左邊 21 與最上面一排 4 所對應的數字 3304 ,故 log2.14 = 0.3304. 對數表. 若 log x = n + α ,

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第三章 指數與對數

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  1. 第三章 指數與對數 3-5 常用對數

  2. 3-5 常用對數 1. 常用對數 2. 對數表 3. 首數與尾數 4. 首數與尾數的應用

  3. 常用對數 (1)以10為底數的對數,稱為常用對數。 (2) 通常把常用對數的底數10省略不寫, 即 。 例如:

  4. 查對數表,求log2.14=? 在最左邊21 與最上面一排4所對應的數字3304,故log2.14=0.3304 對數表

  5. 若log x=n+α, 其中n為整數且α為正純小數或0 , 則n稱為首數,α稱為尾數, 即 。 首數與尾數

  6. 若log x=n+α,其中n為首數,α為尾數, 則真數x與首數 n的關係: (1)真數x為m位整數 log x的首數n=m-1 (2)真數x自小數點後第m位始出現非零數字 log x的首數n=-m 首數與尾數的應用

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