Giảicác phương trình sau
a.
xx
−−
=
82
74
2
b.
68.3
2
=
+
x
x
x
c.
7
7
5
125,0.25,032
+
−
+
=
x
x
x
d.
2457.5.3
12

2655
31
=+
+−−
xx
n.
322
22
2
=−
−+−
xxxx
m.
0273.43
5284
=+−
++
xx
1.
5
24
28
=
−
+
x
xx
2.
62.42
22

8.
xxxx
)5,0.(241252.3)5,0.(88
331
−=++
++
9.
12122
222
10.50425
−−+−−
=+
xxxxxx
10.
022.92
2212
22
=+−
+++ xxxx
11.
xxx
6.52.93.4
=−
12.
4)32(32
=−+







−+






+
xx
15.
2
25353
x
xx
=






−+







65
1
33
2
+
−+
>
x
xx
7.
2)
3
1
.(9)
3
1
(
2
12
>+
+
xx
3. 1 < 5
xx
−
2
< 25 8.
8log2)
16
1

xx
5.
0
13
239
1
>
+
+−
+
x
xx
10. 25.
255102
>+−
xxx
11. 5.4
010.725.2
≤−+
xxx
12.
9339
2
−>−
+
xxx
13. (
3
1
1

>−
−
x
x
3.
( )
132
1
1
2
<++
+
−
x
x
xx
4.
( )
112
1
1
2
≤+−
+
−
x
x
xx
Giải bpt
1. 2log

)1(log1)3(log
22
−+≥+
xx
6. 2
3
2
)3(log)2(log
8
18
>−+−
xx
7.
0))5((loglog
2
4
3
1
>−
x
8.
0)(loglog
2
13
≥
x
9.
0loglog
2
2

(loglog
2
3
6
≥
+
−
+
x
x
x
14.
1)65(log
2
2
≥+−
xx
x
15.
1)93(loglog
9
<−
x
x
16.
2)
16
15
2(loglog
5,02