log 1 = 0
log 10 = 1
log 0.1 = -1
log 10n = n ln 10 / ln 10 = log 10n = n
log a*b = log a + log b
= log a*b = ln a*b /ln 10 = ln a + ln b /ln 10
ln a /ln 10 + ln b/ ln 10 = log a + log b
log a/b = log a - log b
=log a/b = ln a/b /ln10 = ln a -ln b / ln10
ln a /ln 10 - lnb /ln 10 = log a/b = log a -log b
S = log 1/2 + log 2/3 +log 3/4 .................+ log 99/100
s= log ( 1/2 * 2/3 * 3/4 * 4/5 .........* 99/100
s= log 1/100 = log 1 - log 100 = 0 - 2 = -2
itijah taghayor dalla log
log x = ln x /ln 10
) ' log x = 1/ ln 10 * ( ln x
wa minho log x mojaba + wa motzayida 3la lmajal (0 ' + malanihaya
nchalah tkoni fhamtini okhti w ida mafhamtich glili