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1) 70 - 5( x - 3 ) = 45
5( x - 3 ) = 70 - 45
5( x - 3 ) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
2) 12 + ( 5 + x ) = 20
5 + x = 20 - 12
5 + x = 8
x = 8 - 5
x = 3
3) 130 - ( 100 + x ) = 25
100 + x = 130 - 25
100 + x = 105
x = 105 - 100
x = 5
4) 175 + ( 30 - x ) = 200
30 - x = 200 - 175
30 - x = 25
x = 30 - 25
x = 5
5) 5( x + 12 ) + 22 = 92
5( x + 12 ) = 92 - 22
5( x + 12 ) = 70
x + 12 = 70 : 5
x + 12 = 14
x = 14 - 12
x = 2
6) 95 - 5( x + 2 ) = 45
5( x + 2 ) = 95 - 45
5( x + 2 ) = 50
x + 2 = 50 : 5
x + 2 = 10
x = 10 - 2
x = 8
7) 14x + 54 = 82
14x = 82 - 54
14x = 28
x = 28 : 14
x = 2
8) 15x - 133 = 17
15x = 17 + 133
15x = 150
x = 150 : 15
x = 10
9) 155 - 10( x + 1 ) = 55
10( x + 1 ) = 155 - 55
10( x + 1 ) = 100
x + 1 = 100 : 10
x + 1 = 10
x = 10 - 1
x = 9
a. 95 - 5.(x + 2) = 45
5.(x + 2) = 95 - 45
x + 2 = 50 : 5
x = 10 - 2
x = 8
b. 14x + 54 = 82
14x = 82 - 54
x = 28 : 14
x = 2
c. 15x - 133 = 17
15x = 17 + 133
x = 150 : 15
x = 10
d. 155 - 10.(x + 1) = 55
10.(x + 1) = 155 - 55
x + 1 = 100 : 10
x = 10 - 1
x = 9
14x + 54 = 82
175 + (30 - x) = 2001
1551- 10 (x + 1) = 55
5 . (x + 12) + 22 = 92
6 . (x + 23) + 40 = 100
14x + 54 = 82
14x = 28
x = 2
175 + (30 - x) = 2001
30 - x = 1826
x = 30 - 1826
x = - 1796
1551 - 10 ( x + 1 ) = 55
10(x + 1) = 1496
x + 1 = 149,6
x = 148,6
5 . (x + 12) + 22 = 92
5 . (x + 12) = 70
x + 12 = 14
x = 2
6 . (x + 23) + 40 = 100
6 . (x + 23) = 60
x + 23 = 10
x = - 13
\(14x+54=82\)
\(\Leftrightarrow14x=82-54\)
\(\Leftrightarrow14x=28\)
\(\Leftrightarrow x=2\)
Vậy \(x=2\)
\(175+\left(30-x\right)=2001\)
\(\Leftrightarrow30-x=2001-175\)
\(\Leftrightarrow30-x=1826\)
\(\Leftrightarrow x=-1796\)
Vậy \(x=-1796\)
\(1551-10\left(x+1\right)=55\)
\(\Leftrightarrow10.\left(x+1\right)=1551-55\)
\(\Leftrightarrow10.\left(x+1\right)=1496\)
\(\Leftrightarrow x+1=\frac{1496}{10}\)
\(\Leftrightarrow x=\frac{1486}{10}\)
Vậy \(x=\frac{1486}{10}\)
\(5.\left(x+12\right)+22=92\)
\(\Leftrightarrow5.\left(x+12\right)=70\)
\(\Leftrightarrow x+12=14\).
\(\Leftrightarrow x=2\)
Vậy \(x=2\)
\(6.\left(x+23\right)+40=100\)
\(\Leftrightarrow6.\left(x+23\right)=60\)
\(\Leftrightarrow x+23=10\)
\(\Leftrightarrow x=-13\)
Vậy \(x=-13\)
a) \(10+2x=4^5:4^3\)
\(\Leftrightarrow10+2x=4^2\)
\(\Leftrightarrow2x=6\)
\(\Leftrightarrow x=3\)
b) \(14x+54=82\)
\(\Leftrightarrow14x=28\)
\(\Leftrightarrow x=2\)
c) \(15x-133=17\)
\(\Leftrightarrow15x=150\)
\(\Leftrightarrow x=10\)
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
Bài 2:
a: =>x-45=-20
hay x=25
b: =>35+30-5x=-12+112=100
=>65-5x=100
=>5x=-35
hay x=-7
c: =>x-124=1000
hay x=1124
d: \(\Leftrightarrow46-\left(3x-2\right)^3=-18\)
\(\Leftrightarrow\left(3x-2\right)^3=64\)
=>3x-2=4
hay x=2
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
\(2^2.\left(x+3^2\right)-5=55\)
\(4.\left(x+9\right)-5=55\)
\(4.\left(x+9\right)=55+5\)
\(4.\left(x+9\right)=100\)
\(x+9=100:4\)\(\)
\(x+9=25\)
\(x=25-9\)
\(x=16\)
\(7.\left(x+5^2\right)-20=190\)
\(7.\left(x+25\right)-20=190\)
\(7.\left(x+25\right)=190+20\)
\(7.\left(x+25\right)=210\)
\(x+25=210:7\)
\(x+25=30\)
\(x=30-25\)
\(x=5\)
\(6.\left(x+2^3\right)+40=100\)
\(6.\left(x+8\right)+40=100\)
\(6.\left(x+8\right)=100-40\)
\(6.\left(x+8\right)=60\)
\(x+8=60:6\)
\(x+8=10\)
\(x=10-8\)
\(x=2\)
\(95-5.\left(x+2\right)=45\)
\(5.\left(x+2\right)=95-45\)
\(5.\left(x+2\right)=50\)
\(x+2=50:5\)
\(x+2=10\)
\(x=10-2\)
\(x=8\)
\(15.x-133=17\)
\(15.x=17+133\)
\(15.x=150\)
\(x=150:15\)
\(x=10\)
\(14.x+54=82\)
\(14.x=82-54\)
\(14.x=28\)
\(x=28:14\)
\(x=2\)
1/ 2/ 3/ 4/
22(x + 32) - 5 = 55 7(x + 52) - 20 = 190 6(x + 23) + 40 = 100 95 - 5(x + 2) = 45
4(x + 9) - 5 = 55 7(x + 25) - 20 = 190 6(x + 6) + 40 = 100 5(x + 2) = 95 - 45
4(x + 9) = 55 + 5 7(x + 25) = 190 + 20 6(x + 6) = 100 - 40 5(x + 2) = 50
4(x + 9) = 60 7(x + 25) = 210 6(x + 6) = 60 x + 2 = 50 : 5
x + 9 = 60 : 4 x + 25 = 210 : 7 x + 6 = 60 : 6 x + 2 = 10
x + 9 = 15 x + 25 = 30 x + 6 = 10 x = 10 - 2
x = 15 - 9 x = 30 - 25 x = 10 - 6 x = 8
x = 6 x = 5 x = 4
5/ 6/
15x - 133 = 17 14x + 54 = 82
15x = 17 + 133 14x = 82 - 54
15x = 150 14x = 28
x = 150 : 15 x = 28 : 14
x = 10 x = 2