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\(70-5\cdot\left(x-3\right)=45\)
\(\Rightarrow5\cdot\left(x-3\right)=70-45\)
\(\Rightarrow5\cdot\left(x-3\right)=25\)
\(\Rightarrow x-3=\dfrac{25}{5}\)
\(\Rightarrow x-3=5\)
\(\Rightarrow x=5+3=8\)
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\(10+2\cdot x=4^5:4^3\)
\(\Rightarrow10+2\cdot x=4^2\)
\(\Rightarrow10+2\cdot x=16\)
\(\Rightarrow2\cdot x=16-10\)
\(\Rightarrow2\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
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\(2\cdot x-138=2^3\cdot3^2\)
\(\Rightarrow2\cdot x-138=72\)
\(\Rightarrow2\cdot x=72+138\)
\(\Rightarrow2\cdot x=210\)
\(\Rightarrow x=\dfrac{210}{2}=105\)
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\(231-\left(x-6\right)=1339:12\)
\(\Rightarrow231-x+6=1339:12\)
\(\Rightarrow237-x=\dfrac{1339}{12}\)
\(\Rightarrow x=237-\dfrac{1339}{12}\)
\(\Rightarrow x=\dfrac{1505}{12}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 2x - 138 = 23 . 32
2x = 72 + 138
x = 210 : 2
x = 105
b. 213 - (x - 6) = 1339 : 13
213 - (x - 6) = 103
x - 6 = 213 - 103
x = 110 + 6
x = 116
2.x - 138 = 23 . 32
2.x - 138 = 8 . 9
2.x - 138 = 72
2.x = 72 + 138
2.x = 210
x = 105
b) 231 - (x - 6) = 1339 : 13
231 - x + 6 = 103
231 - x = 103 - 6
231 - x = 97
x = 231 - 97
x = 134
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2 . x - 138 = 23 . 32
2 . x - 138 = 72
2 . x = 138 + 72
2 . x = 210
x = 210 : 2
x = 105
\(a,2x-138=2^3\cdot3^2\)
\(2x-138=72\)
\(2x=72+138=210\)
\(x=210:2\)
\(x=105\)
\(b,231-\left(x-6\right)=1339:13\)
\(231-x+6=103\)
\(237-x=103\)
\(x=237-103\)
\(x=134\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2 . x - 138 = 23 . 32
2 . x - 138 = 8 . 9
2 . x - 138 = 72
2 . x = 72 + 138
2 . x = 210
x = 210 : 2
x = 105
b) 231 - ( x - 6 ) = 1339 : 13
231 - ( x - 6 ) = 103
x - 6 = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
a, 2x-138=32.9
2x-138=288
2x=288+138
2x=426
x=213
b, 231-(x-6)=103
x-6=231-103
x-6=128
x=134
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2x - 138 = 23 . 32
=> 2x - 138 = 8 . 9
=> 2x - 138 = 72
=> 2x = 72 + 138
=> 2x = 210
=> x = 210 : 2
=> x = 105
b) 231 - ( x - 6 ) = 1339 : 13
=> 231 - ( x - 6 ) = 103
=> x - 6 = 231 - 103
=> x - 6 = 128
=> x = 128 + 6
=> x = 134
a) 2 . x - 138 = 23.32 b) 231 - (x -6) = 1339 : 13
2. x - 138 = 8 . 9 231 - (x -6 ) = 103
2 . x = 72 + 138 x - 6 = 231 - 103
2. x = 210 x - 6 = 128
x = 210 : 2 x = 128 + 6
x = 105 x = 134
vậy x = 105 vậy x = 134
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2.x-138=23.32 b) 231-(x-6)=1339:13
2.x-138=25=32 231-x+6=103
2.x=32+138 231-x=231-103
2.x=160 231-x=128
x=160:2 x=231-128
x=80 x=103
a)
2x - 138 = 23 . 32
=> 2x - 138 = 8 . 9
=> 2x - 138 = 72
=> 2x = 72 + 138
=> 2x = 210
=> x = 210 : 2
=> x = 105
Vậy x = 105
b)
231 - (x - 6) = 1339 : 13
=> 231 - (x - 6) = 103
=> x - 6 = 231 - 103
=> x - 6 = 128
=> x = 128 + 6
=> x = 134
Vậy x = 134
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 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
b) 10 + 2.x = 4^5 : 4^3
10 + 2.x=4^2
10 + 2.x=16
2.x=16-10
2.x=6
x=6:2
x=3
c) 2x - 138 = 2^3 . 3^2
2x - 138 = 8.9
2x - 138 = 72
2x=72+138
2x=210
x=210:2
x=105
d) 231 - (x - 6) = 133 : 13
(đề sai)
x=105
x*6,5+x*3,5=20