: loga b : b a.
, a, b.
loga b = x ax = b
loga x + loga y = loga xy
г
loga x - loga y = loga x/y
b
loga xb = b loga x
a b ,
logak bk = loga b
:
- 10. lg x. log10 x = lg x. .
lg 10 = 1, lg 10000 = 4, lg 0.001 = -3
- e ( e = 2,71828...). ln x. loge x = ln x. , (ln x)/ = 1/x , .
ln e = 1, ln eb = b, .. b ' , ln e-2 = -2