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a, \(x=\dfrac{3}{4}-1=\dfrac{3}{4}-\dfrac{4}{4}=-\dfrac{1}{4}\)
b, \(x=\dfrac{1}{5}-4=\dfrac{1}{5}-\dfrac{20}{5}=-\dfrac{19}{5}\)
c, \(x=2+\dfrac{1}{5}=\dfrac{10}{5}+\dfrac{1}{5}=\dfrac{11}{5}\)
d, \(x=\dfrac{1}{81}-\dfrac{5}{3}=\dfrac{1}{81}-\dfrac{135}{81}=-\dfrac{134}{81}\)
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5x=125
=>5xx=53
=> x=3
Vậy x=3
32x=81
=>32x=34
=>2x=4
=>x=4:2=2
Vậy x=2
Tk mk
a, => 5^x = 5^3
=> x = 3
b, => 3^2x = 3^4
=> 2x = 4
=> x = 2
Tk mk nha
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a) 5x = 125
53 = 125
Vậy x = 3
b) 3x = 81
34 = 81
Vậy x = 4
c)52x-3 - 2 . 52 = 52 . 3
52x-3 = 52 . 3 + 2. 52
52x-3 = 52 . ( 3 + 2 )
52x-3 = 52 . 5
52x-3 = 53
=> 2x - 3 = 3
2x = 6
x = 3
Vậy x = 3
![](https://rs.olm.vn/images/avt/0.png?1311)
a)5^x=125
125=5^3
5^x=5^3
=>x=3
b)3^2x=81
81=3^4
3^2x=3^4
=>2x=4
x=4:2
x=2
3
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b) 100 - 7x +35 =65
7x = 100 +35 -65 = 70
x = 70/7 =10
c) 4x -12 = 64+8
4x = 84
x = 21
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a: =>1/3:x=3/5-2/3=9/15-10/15=-1/15
=>x=-1/3:1/15=5
b: \(\Leftrightarrow x\cdot\dfrac{2}{3}-3=\dfrac{2}{5}\cdot\left(-10\right)=-4\)
=>x*2/3=-1
=>x=-3/2
c: =>2x+1=4 hoặc 2x+1=-4
=>x=3/2 hoặc x=-5/2
h: =>x-3=4
=>x=7
g: =>2x-1=3
=>2x=4
=>x=2
f: \(\Leftrightarrow x\cdot\left(\dfrac{3}{2}-\dfrac{7}{3}\right)=\dfrac{3}{2}-\dfrac{2}{3}\)
=>x*-5/6=5/6
=>x=-1
d: =>|2x-1|=3
=>2x-1=3 hoặc 2x-1=-3
=>x=-1 hoặc x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3/4 - x = 1 c) x - 1/5 = 2
x = 3/4 - 1 x = 2 + 1/5
x = -1/4 x = 11/5
Vậy x = -1/4 Vậy x = 11/5
b) x+4 = 1/5 d) x + 5/3 = 1/81
x = 1/5 -4 x = 1/81 -5/3
x = -19/5 x = -134/81
Vậy x = -19/5
a) 3/4 - x = 1
\(x=\frac{3}{4}-1\)
\(x=\frac{-1}{4}\)
b) x + 4 = 1/5
\(x=\frac{1}{5}-4\)
\(x=\frac{-19}{5}\)
c) x - 1/5 = 2
\(x=2+\frac{1}{5}\)
\(x=\frac{11}{5}\)
d) x + 5/3 = 1/81
\(x=\frac{1}{81}-\frac{5}{3}\)
\(x=\frac{-134}{81}\)
chúc bạn học tốt
c) 3.(x+5)3 =81
(x+5)3 = 81 : 3
(x+5)3 = 27
(x+5)3= 33
x+5= 3
x = 3+5
x= 8