... x 16 2+ =
Bµi 15: Gi¶i c¸c ph¬ng tr×nh:
a.
( )
( )
2
x lg x x 6 4 lg x 2+ − − = + +
b.
( ) ( )
3 5
log x 1 log 2x 1 2+ + + =
c.
( ) ( ) ( ) ( )
2
3 3
x 2 log x 1 4 x 1 log x 1 16 0+ + + + + − =
d.
( ... 5
log x log x 6 log x 2= + +
b.
5 25 0,2
log x log x log 3+ =
c.
( )
2
x
log 2x 5x 4 2 + =
d.
2
x 3
lg(x 2x 3) lg 0
x 1
+
+ + =...
... P=
−
+
+
++
−
+
a
a
a
aa
a
a
a
1
1
.
1
12
3
3
a) Rót gän P
b) XÐt dÊu cđa biĨu thøc P.
a−1
Bµi 9: Cho biĨu thøc:
P=
.
1
1
1
1
1
2
:1
−
+
−
++
+
+
−
+
x
x
xx
x
xx
x
a) ... Cho biĨu thøc :
+
+
−
+
+
=
6
5
3
2
aaa
a
P
a−2
1
a) Rót gän P
b) T×m gi¸ trÞ cđa a ®Ĩ P<1
Bµi 2: Cho biĨu thøc:
P=
...