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\(3x+17=12\\ 3x=12-17\\ 3x=\left(-5\right)\\ x=\dfrac{-5}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
a.
ƯCLN $ =5^2=25$
BCNN $=3.5^2.7=525$
b.
ƯCLN $=3$
BCLNN $=2^2.3^2.5.7.11=13860$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow x\left(\frac{1}{2}-\frac{2}{3}\right)=\frac{7}{12}\Rightarrow x\cdot\left(\frac{3}{6}-\frac{4}{6}\right)=\frac{7}{12}\)
\(\Rightarrow x\cdot\left(-1\right)=\frac{7}{12}\Rightarrow x=\frac{7}{12}:\left(-1\right)=\frac{7}{-12}\)
\(c,\frac{\left(x-5\right)}{12}\cdot\frac{9}{29}=\frac{-6}{29}\Rightarrow\frac{\left(x-5\right)}{12}=\frac{-6}{29}:\frac{9}{26}\)
\(\frac{\Rightarrow\left(x-5\right)}{12}=\frac{-6}{9}=\frac{-2}{3}\Rightarrow x-5=-\frac{2}{3}\cdot12\)
\(\Rightarrow x-5=\frac{-24}{3}=-8\Rightarrow x=-8+5=-3\)
\(a,0,5x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow\frac{1}{2}x-\frac{2}{3}x=\frac{7}{12}\)
\(\Rightarrow-\frac{1}{6}x=\frac{7}{12}\)
\(\Rightarrow x=-\frac{7}{2}\)
\(c,\frac{x-5}{12}\cdot\frac{9}{29}=-\frac{6}{29}\)
\(\Rightarrow\frac{x-5}{12}=-\frac{2}{3}\)
\(\Rightarrow x-5=12.\left(-\frac{2}{3}\right)\)
\(\Rightarrow x-5=-8\)
\(\Rightarrow x=-3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= [(-125).(-8)].[(-4).25].3
= 1000. (-100).3
= (-100000).3
= -300000
![](https://rs.olm.vn/images/avt/0.png?1311)
| 3x+1|-17=-12
| 3x+1|=-12+17
|3x+1|=5
=>3x+1 thuộc {5;-5}
=>3x thuộc {4;-6}
Do 3x chia hết cho 3 nên 3x=-6
x=-6:3=-2
Vậy x=-2
3x + 17 = 12
=> 3x = 12 - 17
=> 3x = -5
=> x = \(\frac{-5}{3}\)
3x = 12 - 17
3x = - 5
x = - 5 : 3
x = \(\frac{-5}{3}\)