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18.03.2013

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x a y, a, x ( logax).

.. ay = x logax = y (a > 0, a ≠ 1, x > 0).

lg: log10x = lgx. e (e ≈ 2.718281828...) ln : logex = lnx

.
1. : alogab = b;
2. : loga(bc) = logab + logac;
3. : loga(b/c) = logab - logac;
4. logabm = mlogab;
5. loganb = 1/nlogab;
6. logan bm = m/nlogab;
7. logab = 1/logba;
8. : logab = logb/logca;
9. logaa = 1, loga1 = 0.


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