logarit
1)
bxba
a
x
log
=⇔=

( a,b >0; a≠ 1).
2)
ba
b
a
=
log
.
3)
ba
b
a
=
log
b
m
b
bb
bb
b
b
bbbb
a

a
b
b
b
n
b
b
a
c
c
a
a
n
a
log
1
log)12
log
log
log)11
log
1
log)10
=
=
=
b
b
bb
bbb

a
aaa
a
a
a
=






=
=
=
=
=
−
+
−
)6
))(5
)4
.)3
1)2
1
)1
0
( )
mn