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![](https://rs.olm.vn/images/avt/0.png?1311)
\(-231-\left(x-6\right)=1339:13\)
\(-231-\left(x-6\right)=103\)
\(x-6=-231-103\)
\(x-6=-334\)
\(x=-334+6\)
\(x=-328\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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) 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
![](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)
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6).3 = 3⁴
3x - 6 = 3⁴ : 3
3x - 6 = 3³
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
x - 6 = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6) . 3 = 34
(3x - 6) . 3 = 81
(3x - 6) = 81 : 3
(3x - 6) = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
(x - 6) = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
![](https://rs.olm.vn/images/avt/0.png?1311)
1) \(S=2.2.2..2\left(2023.số.2\right)\)
\(\Rightarrow S=2^{2023}=\left(2^{20}\right)^{101}.2^3=\overline{....6}.8=\overline{.....8}\)
2) \(S=3.13.23...2023\)
Từ \(3;13;23;...2023\) có \(\left[\left(2023-3\right):10+1\right]=203\left(số.hạng\right)\)
\(\) \(\Rightarrow S\) có số tận cùng là \(1.3^3=27\left(3^{203}=\left(3^{20}\right)^{10}.3^3\right)\)
\(\Rightarrow S=\overline{.....7}\)
3) \(S=4.4.4...4\left(2023.số.4\right)\)
\(\Rightarrow S=4^{2023}=\overline{.....4}\)
4) \(S=7.17.27.....2017\)
Từ \(7;17;27;...2017\) có \(\left[\left(2017-7\right):10+1\right]=202\left(số.hạng\right)\)
\(\Rightarrow S\) có tận cùng là \(1.7^2=49\left(7^{202}=7^{4.50}.7^2\right)\)
\(\Rightarrow S=\overline{.....9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =>2x+10=4^2=16
=>2x=6
=>x=3
b: =>2x-138=8*9=72
=>2x=138+72=210
=>x=105
c: =>231-(x-6)=103
=>x-6=128
=>x=134
\(a.10+2x=4^5:4^3\\ \Leftrightarrow10+2x=4^2\\ \Leftrightarrow2x=6\\ \Leftrightarrow x=3\)
\(b.2x-138=2^3.3^2\\ \Leftrightarrow2x-138=72\\ \Leftrightarrow x=210:2\\ \Leftrightarrow x=105\)
\(c.231-\left(x-6\right)=1339:13\\ \Leftrightarrow231-\left(x-6\right)=103\\ \Leftrightarrow x-6=128\\ \Leftrightarrow x=134\)
Chú ý : Nếu bạn chưa học \(\Leftrightarrow\) thì bạn bỏ đi nha !
1. Số số hạng tổng S là:
(2016-3):3+1=672
Tổng S là:
(3+2016).672:2=678384
3.
231-(x-6)=1339:13
231-(x-6)=103
x-6=231-103
x-6=128
x=128+6
x=134