ce qu'il faut savoir ...
- log (x) = ln (x) / ln (10)
- log (1) = 0 et log (10) = 1
- log (x.y) = log (x) + log (y)
- log (1/x) = - log (x)
- log (x/y) = log (x) - log ( y)
- log (xn ) = n.log (x)
- log (a) = log (b) <=> a = b
- log (a) < log (b) <=> a < b
- log (a) > log (b) <=> a > b
- log (a) > 0 <=> a > 1
- log (a) < 0 <=> 0 < a < 1
Exercices pour s'entraîner