Bài tập phương trình mũ
Bài 1 : Giải cỏc phương trỡnh:
3
13 1
16
x
3 4 2
2 2
1 2
5) 32 2 2x 32 2 6) 1 7)
1 1
2 5 2
x x
2 x 2 x 12 2 x
8) 5x x24 25 9) 3x.2x+1 = 72 10) 11)
2 2
1 2
27
60 20 5
3
4x1 x3 x1 12) 5x+1 + 6 5x – 3 5x-1 = 52 13) 2 3x+1 – 6 3x-1 – 3x = 9 14) 4x + 4x-2 – 4x+1 = 3x – 3x-2 – 3x+1
2 x
.4 0, 25 64
x x
3
1 0, 2 25
0, 04
x
2
x x
x x
e
e e
5 8 1 100
x
x x
x
x
x x Bài 2 : Giải cỏc phương trỡnh: 1) 4x + 2x+1 – 8 = 0 2) 4x+1 – 6 2x+1 + 8 = 0
3) 34x+8 – 4 32x+5 + 27 4) 16x17.4x160 6) 1
49x7x 8 0
8)
9) 4
7 4 3 2 3 6
4 22x1 2x3 64 0
1 1 2
3
1 3
3
0,7 7
6 100
x
x
4x 2x 2x 12 2
3 x2.3x150
15)5x153x260 16) 33.4x2.10x25x 0 17) 2 3 2 3 4 18)
19)
5 2 6 49 20 6 2
Bài 3 : Giải cỏc phương trỡnh1) 31+x + 31-x = 10 2) 5x-1 + 53 – x = 26 3) 2 3 x 2 3x 2
74 3 x 32 3x 20
10 16
16
2 2
cos
3
3( 1)
sin cos
9 x 9 x 10
2.4x x6x x9x x
2.25x x10x x 2 x x 2 4 4
3 x8.3x x 9.9 x 2 2
2 x 9.2xx 2 x
Bài 4 : Giải cỏc phương trỡnh 1) 9x + 6x = 2 4x 2) 4x – 2 52x = 10x 3) 27x + 12x = 2 8x
4) 32x+4 + 45 6x – 9.22x+2 = 0 5) 22x21 9.2x2x 22x2 0 6) 125x + 50x = 23x+1 7) 25x + 10x = 22x+1 8) 3 9)
2 5 3 7 5
9 6
4
2 x x x
10)2x25x6 21x2 2 265x 1 11)
2
12 2
1 2
6 2
1 3
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Trang 2Bài 4 : Giải các phương trình 1).(3 5)x 16(3 5)x 2x 3 2) x x
(7 4 3) 3(2 3) 2 0 3).3.16x 2.8x 5.36x 4) 82x 23x 3x 12 0 5)
2 3 x 2 3 x 4 7) 3 25x-2 + (3x - 10)5x-2 + 3 - x = 0 8) x x x
2 3 2 3
9)5x + 5x +1 + 5x + 2 = 3x + 3x + 3 - 3x +1 1
2 1
2 1
2
5 6 3
1 8
1 2
2 1
4 3 3
3 3
3 2
2 2 20 2
16 2
19 4
2
18
4 1 15 17 10
24 5 24 5 16 0
4 6 6 13
9
6
15
0 4 5
5 14 3
36 8
12 4
2 11 1 1
10
2 2
2
x x
x x
x x x
x x
x
x
x x
x x
x x
x
x x
x x
x x
x x x
x
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)
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)
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)
)
24
1 )
23 1
1 )
22 12
5 3
2
)
21
7 6
2 5
2 8
4 4
2
2 2 1
2 2
1
2
2
x x
x x
x
x x
x x
x
x x
x x x
x
2 3 2 3 4 0 28)2.16 15.4 8 0
)
2 5 3 16 5 3 ) 30 0
2 3 2 3 3 4
7
)
0 12 2
8 33 9
6 4 2 32 36
5 81 2 16
3
31
3 3 2 1
1 1
x x x x
x x x
x x
)
)
)
x-1 3 x
x 7
-3x
3
-x
x 2 1 x
4
5 x
x 2 x 1 x
10 0,01
.5 2 42) 1
8
41)
0 16
-.0,5
2 40) 2
4 2
39)
81 3
1 3 3 38)
2 2
3 3 3
1 1 3
1 10
3
1 2
2 1 1
2 2 1 2
25 , 0
125 , 0 4
0 2 1 2 2 3
)
37
5 3 2 5
3 2
) 36 0 4 3
) 35 5 4
3
)
34
x x
x x
x x x
x
x x x x x x
x x x
x
x x
x
x
1
2 1
1 12
50 25 , 4
25
x 1 1
-x 1
-2x
x x
x x 3
x x
10 46) 0,2
2.5 -3.5
45)
2 -3 3 -2 44) 125
27 9
25
0,6
43)
2 2
2 2 2
0 24 -10.2 -4 48) 0
3 36.3
9
2 2
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