10-logaritmen av 10,100,1000 osv. kan förenklas med huvudräkning genom att räkna antalet nollor i argumentet. Om argumentet är ett decimaltal mindre än 1 räknar man också nollor, men sätter ett minustecken framför antalet. I tabellen syns några exempel.
lg(a) | Antal nollor | lg(a)= |
---|---|---|
lg(0.01) | Två | -2 |
lg(0.1) | En | -1 |
lg(1) | Noll | 0 |
lg(10) | En | 1 |
lg(100) | Två | 2 |
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