Giảicác phương trình saua.
Trang 1Giảicác phương trình sau
a 2 4x2 − 7 = 8 −x
b 3 .8x+ 2 =6
x
7 7
5
125 , 0 25
,
0
+
x
x
d 3x− 2 5x− 1 7x = 245 e 5 .8 −x1 =500
x
x x
x 3 2 24 6
3
.
g 5 7x = 7 5x h 15x + 5 3x = 5x + 5 k 4x2 +x +21 −x2 =2( 1 +x) 2 +1
l 5x− 1 + 5 −x+ 3 = 26 n 2x2 −x −22 +x−x2 =3 m 3 4x+ 8 − 4 3 2x+ 5 + 27 = 0
2
4
2
8
=
−
+
x
x
x
2 2cos 2x +4.2sin 2x =6 3 3 9 273 675
2 1 3
2x− − x− + x =
4 3 4x + 2 9x = 5 6x 5 3 25x + 2 49x = 5 35x 6 125x+ 50x = 2 3x+ 1
7 3 8x + 4 12x − 18x − 2 27x = 0
8 8x+ 1 + 8 ( 0 , 5 ) 3x + 3 2x+ 3 = 125 − 24 ( 0 , 5 )x
10 50 4
25 x−x + x−x + = x−x −
10 22 2 1 9.2 2 22 2 0
= +
x
6 5 2
.
9
3
.
12 2 + 3 x + ( 2 − 3 )x = 4 13. 7 + 48 x+ 7 − 48 x = 14
14 2 + 1 x+ 2 − 1 x = 2 2 15 3 5 3 5 2 2
x x x
=
+
16 (7 + 3 5)x+ 12(7 − 3 5)x = 8 2x
Giải bất phương trình sau
6
3
3 1
1 1 3
1
1 − ≥ −
+
2 3 215 6 3 12
+
−
+ x > x
3
1 (
9 ) 3
1
1 2
>
x
3 1 < 5 x2 −x
16
1 ( ) 4
1
1
2
1 2
2 1
21
≤
−
− +
−
x
x x
1
3
2
3
>
+
+
x
x
x
10 25.2x− 10x + 5x > 25
11 5.4x+ 2 25x − 7 10x ≤ 0 12 9x − 3x+ 2 > 3x − 9
1 1
3
) 3 10 ( )
3
+
−
−
−
<
x x
x
14 ( + −x2 +x+ −x2 +x+ < − −x2 +x
) 1 5 ( 3 2
) 1
Giải bpt
1 ( 2 − + 1)x < 1
x
>
− x −
x
3 ( 2 3) 1 1
1
2+ + + <
−
x
x
x
1
2 − + + ≤
−
x
x
x x
Giải bpt
1 2log2 (x-1)≤ log2 (5- x) + 1 2 log ( 2 4 3 ) 1
Trang 23 log ( 6 8) 2log5( 4) 0
2
5
1 x − x+ + x− < 4 log (4 6) 0
3
x x
5 log2(x+3)≥1+log2(x−1) 6 2log ( 2) log ( 3) 32
8 1
7 log (log4( 2 5)) 0
3
2 1
9 log22x+log2x≤0 10 log 25 log 3
3
11
2
3 4 log
13 log (log2 21) 0
3
+
−
x
15 log (log93x − 9 ) < 1
16
15 2 ( log
17 6log2x + xlog 6x ≤ 12