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7) -4(x +41) = 400
x + 41 = 400 : -4 = -100
x = -100 - 41 = 141
8) 2x - 49 = 5 . 32 = 5 . 9
2x = 9 + 49 = 58
x = 58 : 2 = 29
7) \(-4x-246=400\Leftrightarrow-4x=646\Leftrightarrow x=-161,5\)
8) \(2x-49=45\Leftrightarrow2x=94\Leftrightarrow x=47\)
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\(\left(x+1\right)^3=2^3.3+3\)
\(\Rightarrow\left(x+1\right)^3=24+3=27=3^3\)
\(\Rightarrow x+1=3\Rightarrow x=2\)
\(5+2.3^x+2=23\)
\(\Rightarrow7+2.3^x=23\)
\(\Rightarrow2.3^x=23-7=16\)
\(\Rightarrow3^x=8.\)
Mà số 3 lũy thừa mấy cũng không thể bằng 8 => x không thỏa mãn.
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1)
a) 2x + 5 = 3⁴ : 3²
2x + 5 = 3²
2x + 5 = 9
2x = 9 - 5
2x = 4
x = 4 : 2
x = 2
b) (3x - 24).73 = 2.74
(3x - 24).73 = 148
3x - 24 = 148/73
3x = 148/73 + 24
3x = 1900/73
x = 1900/73 : 3
x = 1900/219
c) [3.(42 - x)] + 15 = 23.3
126 - 3x + 15 = 69
141 - 3x = 69
3x = 141 - 69
3x = 72
x = 72 : 3
x = 24
d) 126 + (132 - x) = 300
132 - x = 300 - 126
132 - x = 174
x = 132 - 174
x = -42
2)
a) 120 - (x + 55) = 60
x + 55 = 120 - 60
x + 155 = 60
x = 60 - 55
x = 5
b) (7x - 11).3 = 25.52 + 200
(7x - 11).3 = 1500
7x - 11 = 1500 : 3
7x - 11 = 500
7x = 500 + 11
7x = 511
x = 511 : 7
x = 73
c) 2x + 2x + 4 = 544
4x = 544 - 4
4x = 540
x = 540 : 4
x = 135
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a/ x + 2x + 3x = 36
=> 6x = 36
=> x = 6
Vậy ..
b/ 7x - 2x - x = 24
=> 4x = 24
=> x = 6
Vậy ...
c/ (x : 5) - 10 = 5
=> x : 5 = 15
=> x = 75
Vậy ...
d/ 7. (x+3) = 49
=> x + 3 = 7
=> x = 4
Vậy ....
e/ (x - 5) . 4 = 32
=> x - 5 = 8
=> x = 13
Vậy. ..
g/ 7x - 3 = 25
=> 7x = 28
=> x = 4
Vậy ...
h/ 17 - (x :3) = 10
=> x : 3 = 17 - 10
=>x : 3 = 7
=> x = 21
Vậy ..
a) x + 2x + 3x = 36
=> 6x = 36
=> x = 6
b)7x - 2x - x = 24
=> 4x = 24
=> x = 6
c) (x : 5 ) - 10 = 5
=> x : 5 = 15
=> x = 3
d) 7 . ( x + 3 ) = 49
=> x + 3 = 7
=> x = 4
e) ( x - 5 ) . 4 =32
=> x - 5 = 8
=> x = 3
g) 7x - 3 = 25
=> 7x = 28
=> x = 4
h) 17 - ( x : 3 ) = 10
=> x : 3 = 7
=> x = 21
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\(=49+\dfrac{8}{23}-5-\dfrac{7}{32}-14-\dfrac{8}{32}\)
\(=30-\dfrac{89}{736}=\dfrac{21991}{736}\)
2x - 49 = 5 x 3 ^ 2
2x - 49 = 5 x 9
2x - 49 = 45
2x = 45 + 49
2x = 94
x = 94 : 2
x = 47
2x-49=5.3^2
2x-49=5.9
2x-49=45
2x=45+49
2x=94
x=94:2
x=47
k linh nhé vũ