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\(\frac{4}{3}+\frac{x}{3}\text{ × }7=6\)
\(\frac{x}{3}\text{ × }7=6-\frac{4}{3}\)
\(\frac{x}{3}=\frac{14}{3}:7\)
\(\frac{x}{3}=\frac{2}{3}\)
\(\Leftrightarrow x=2\)
Các phần còn lại bạn làm tương tự nha
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(82 - 5.x) : 13 - 4 = 0
(82 - 5.x) : 13 = 0 + 4
(82 - 5.x) : 13 = 4
(82 - 5.x) = 4 . 13
(82 - 5.x) = 52
5.x = 82 - 52
5.x = 30
x = 30 : 5 = 6
(32 . 45) : 2 = (x + 70) : 14 - 40
720 = (x + 70) : 14 - 40
(x + 70) : 14 = 720 + 40
(x + 70) : 14 = 760
(x + 70) = 760 . 14
(x + 70) = 10640
x = 10640 - 70
x = 10570
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(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=45
( x + x + x + x + x ) + ( 1 + 2 + 3 + 4 + 5 ) = 45
5x + 15 = 45
5x = 45 - 15
5x = 30
x = 30 : 5
x = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=45
<=> (x+x+x+x+x)+(1+2+3+4+5)=45
<=> 5x+15=45
<=> 5x=30
<=> x=6
![](https://rs.olm.vn/images/avt/0.png?1311)
(x + 1) + (x + 2) + (x + 3) + (x + 4) + (x + 5) = 45
x + 1 + x + 2 + x + 3 + x + 4 + x + 5 = 45
(x + x + x + x + x) + (1 + 2 + 3 + 4 + 5) = 45
5x + 15 = 45
5x = 45 - 15
5x = 30
x = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1+2+.......+x=45\)
\(\Rightarrow\frac{x\left(x+1\right)}{2}=45\)
\(\Rightarrow x\left(x+1\right)=90\)
mà \(90=9.10\)
\(\Rightarrow x=9\)
1 + 2 + 3 + 4 + ... + x = 45
(1 + x) × x : 2 = 45
(1 + x) × x = 45 × 2
(1 + x) × x = 90
(1 + x) × x = 10 × 9
=> x = 9
Vậy x = 9
![](https://rs.olm.vn/images/avt/0.png?1311)
x+1 + x+2 + x+3 + x +4 + x+5 = 45
x + x + x + x + x = 45 -1 -2 -3 -4 -5
5x = 30
x =6