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3x + 1 = 62 - ( 32 - 1 )
3x + 1 = 36 - ( 9 - 1 )
3x + 1 = 28
3x = 28 - 1
3x = 27
3x = 33
=> x = 3
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chúc bạn học tốt đúng thì kb nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 118- ( x + 74 ) = 24
<=> x+ 74 = 118 - 24
<=> x + 74 = 94
<=> x = 94 - 74
Vậy x = 20
b, 25x -2x + 5^2 = 71
<=> 23x + 25 = 71
<=> 23x = 71- 25
<=> 23x = 46
<=> x = 46 : 23
Vậy x = 2
c, ( 7 - 2x ) ^3 =27
<=> ( 7- 2x )^3 = 3^3
=> 7- 2x = 3
<=> 2x = 7-3
<=> 2x = 4
<=> x = 4: 2
Vậy x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 22.23.x=82
22.23.x= 26
25.x = 26
x = 26:25
x = 2
b) 5x-1.52= 252
5x-1.52 = 54
5x-1 = 54: 52
5x-1 = 52
=> x-1=2
x = 2+1
x = 3
c)(2x-1)3=125
(2x-1)3= 53
=> 2x-1=5
2x = 5+1
2x = 6
x = 6:2
x = 3
d) 8x.2x=44
(8.2)x= 44
16x = 44
16x = 256
16x = 162
=> x=2
e) (x2.53)2 = 56
x2.2. 53.2= 56
x4 . 56 = 56
x4 = 56:56
x4 = 50
x4 =1
=> x=1
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 2.(x – 5)+7 = 77
<=> 2.(x – 5) = 70 <=> x – 5 = 35 <=> x = 40
b, x - 1 3 - 3 5 : 3 4 + 2 . 2 3 = 14
<=> x - 1 3 - 3 + 2 4 = 14
<=> x - 1 3 = 14 + 3 - 16 = 1
<=> x – 1 = 1 <=> x = 2
c, 1 + 2 + 2 2 + 2 3 + . . . + 2 2016 = 2 x - 1 - 1
Đặt: A = 1 + 2 + 2 2 + 2 3 + . . . + 2 2016 => 2A = 2 + 2 2 + 2 3 + . . . + 2 2017
=> 2A – A = ( 2 + 2 2 + 2 3 + . . . + 2 2017 ) – ( 1 + 2 + 2 2 + 2 3 + . . . + 2 2016 )
=> A = 2 2017 - 1
Ta có: 1 + 2 + 2 2 + 2 3 + . . . + 2 2016 = 2 x - 1 - 1 => 2 2017 - 1 = 2 x - 1 - 1 => x = 2018
d, 5 2 x - 3 - 2 . 5 2 = 5 2 . 3
<=> 5 2 x - 3 = 5 2 . 3 + 5 2 . 2
<=> 5 2 x - 3 = 5 2 . ( 3 + 2 )
<=> 5 2 x - 3 = 5 3
<=> 2x – 3 = 3 => x = 3
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(288-\left(3x-359\right)=140\)
\(3x-359=288-140\)
\(3x-359=148\)
\(3x=507\)
\(x=169\)
vay \(x=169\)
b) \(\left(3x-2\right)^2=49\)
\(\left(3x-2\right)^2=7^2\)
\(\Rightarrow3x-2=7\)
\(\Rightarrow3x=9\)
\(\Rightarrow x=3\)
vay \(x=3\)
288-(3x-359)=140
3x-359=288-140
3x=148+359
x=507:3
x=169
Vay x=169
![](https://rs.olm.vn/images/avt/0.png?1311)
a) x3 = 64
x3 =43
x=4
b) ( x - 1) 2 = 49
( x - 1) 2 = 72
x-1=7
x=8
c) x12 = x
x=1;x=0
d) 5x-1 = 125
5x-1 = 53
x-1=3
x=4
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>12x-64=32
=>12x=96
=>x=8
b: =>x-1=5
=>x=6
c: =>2^x*3=96
=>2^x=32
=>x=5
a) \(2^2.2^4.x=16^2\)
\(2^6x=\left(2^4\right)^2\)
\(2^6.x=2^8\)
\(x=2^8:2^6\)
\(x=2^2\)
\(x=4\)
vay \(x=4\)
b) \(5^{2x+1}=125\)
\(5^{2x+1}=5^3\)
\(\Rightarrow2x+1=3\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=1\)
vay \(x=1\)
c) \(\left(2x-1\right)^3=64\)
\(\left(2x-1\right)^3=4^3\)
\(\Rightarrow2x-1=4\)
\(\Rightarrow2x=5\)
\(\Rightarrow x=\frac{5}{2}\)
vay \(x=\frac{5}{2}\)
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