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a)2x.3+12=24
2x.3=24-12
2x.3=12
2x=12:3
2x=4
2x=22
=>x=2
2x . 3 + 12 = 24
2x . 3 = 24 - 12
2x . 3 = 12
2x = 12 : 3
2x = 4
2x = 22
=> x = 2
b) 2x . 51 + 2 = 47
2x . 5 = 47 - 2
2x . 5 = 45
2x = 45 : 5
2x = 9
=> ko có giá trị x
![](https://rs.olm.vn/images/avt/0.png?1311)
\(4\cdot x^3+15=47\) \(4\cdot2^x-3=125\)
\(4x^3=47-15\) \(4\cdot2^x=125+3\)
\(4x^3=32\) \(4\cdot2^x=128\)
\(x^3=32:4\) \(2^x=128:4\)
\(x^3=8\) \(2^x=32\)
\(x^3=2^3\) \(2^x=2^5\)
\(\Rightarrow x=2\) \(\Rightarrow x=5\)
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x=( 2^47+4^50)( 3^15-3^12)( 2^4-4^2)/2016
=(2^47+4^50)(3^15-3^12)(16-16)/2016
=0/2016=0
Vậy x=0
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a) 3x - (x.15) = 47
3x - 15x = 47
-12x = 47
x = -47/12
b) x.2 + x.1/5 = 1 và 3/5
x.(2+1/5) = 8/5
x.11/5 = 8/5
x = 8/11
c) 2/3.x = 1/2.x + 5/6
2/3.x - 1/2.x = 5/6
1/6.x = 5/6
x = 5
3x - 15x = 47
x ( 3 - 15 ) = 47
-12x = 47
x = 47 : ( - 12 )
x = \(-\frac{47}{12}\)
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a ) x ∈ ± 23 28 . b ) x ∈ − 23 6 ; 35 6 . c ) x ∈ − 17 60 ; 97 60 . d ) x ∈ 67 140 ; 143 140 .
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Bài 1:tính
a)65.(-19)+19.(-35)
=65.(-19)+(-19).35
=(-19).(65+35)
=(-19).100
=-1900
b)85.(35-27)-35.(85-27)
=85.35-85.27-35.85+35.27
=(85.35-35.85)+(-85.27+35.27)
=27.(-85+35)
=27.(-50)
=1350
c)47.(45-15)-47.(45+15)
=47.[(45-15)-(45+15)]
=47.[30-60]
=47.(-30)
=-1410
Bài2: Tìm các số nguyên x biết
a)(-2).(x+6)+6.(x-10)=8
-2x-12+6x-60=8
4x-72=8
4x=72+8
4x=50
x=\(\frac{25}{2}\)
b)(-4).(2x+9)-(-8x+3)-(x+13)=0
-6x-36+8x-3-x-13=0
x-41=0
x=41
Bài 1: Tính
a) \(65.\left(-19\right)+19.\left(-35\right)\)
= \(-1235+-665\)
= \(-1900\)
b) \(85.\left(35-27\right)-35.\left(85-27\right)\)
= \(-1350\)
c) \(47.\left(45-15\right)-47.\left(45+15\right)\)
=\(-1410\)
Bài 2: Tìm x:
\(\left(-2\right).\left(x+6\right)+6.\left(x-10\right)=8\)
\(x=20\)
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a, 1230 : 3(x – 20) = 10
3(x – 20) = 123
x – 20 = 41
x = 61
b, 250 – 10.(24 – 3x):15 = 244
10.(24 – 3x):15 = 6
10.(24 – 3x) = 90
24 – 3x = 9
3x = 15
x = 5
c, 4 x 3 + 15 = 47
4 x 3 = 32
x 3 = 8 = 2 3
x = 2
d, 65 - 4 x + 2 = 2014 0
65 - 4 x + 2 = 1
4 x + 2 = 64 = 4 3
x + 2 = 3
x = 1
e, 4 . 2 x - 3 = 125
4 . 2 x = 128
2 x = 32 = 2 5
x = 5
x+ (-15) = 21
x= 21 - (-15)
x= 36
Vậy...
17x - ( -x-2) = 3x +47
17+ x +2 = 3x+47
19+x = 3x+47
19+x -3x = 47
19+ (-2x) = 47
-2x= 47-19
-2x=28
x= 28: ( -2)
x= -14
Vậy...