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1) 3x = 45 + 15 = 60
x = 60 : 3 = 20
2) 5x = 50 - 35 = 15
x = 15 : 5 = 3
3) (2x - 5) + 17 = 6
2x - 5 = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2 = -3
4) 10 - 2(4 -3x) = -4
2(4 - 3x) = -4 - 10 = -14
4 - 3x = -14 : 2 = -7
3x = -7 - 4 = -18
x = -18 : 3 = -6
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left\{{}\begin{matrix}\left\{{}\begin{matrix}3x-15=45\Leftrightarrow3x=60\Leftrightarrow x=20\\35-5x=50\Leftrightarrow5x=-15\Leftrightarrow x=-3\end{matrix}\right.\\\left\{{}\begin{matrix}\left(2x-5\right)+17=6\Leftrightarrow2x+5=-11\Leftrightarrow2x=-16\Leftrightarrow x=-8\\10-2\left(4-3x\right)=-4\Leftrightarrow8-6x=14\Leftrightarrow6x=-6\Leftrightarrow x=-1\end{matrix}\right.\\\left\{{}\begin{matrix}-12+3\left(-x+7\right)=-18\Leftrightarrow-3x+21=-6\Leftrightarrow-3x=-27\Leftrightarrow x=9\\24:\left(3x-2\right)=-3\Leftrightarrow3x-2=-8\Leftrightarrow3x=-6\Leftrightarrow x=-2\end{matrix}\right.\\-45:5\left(-3-2x\right)=3\Leftrightarrow-15-10x=-15\Leftrightarrow10x=0\Leftrightarrow x=0\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5) - 12 + 3(-x + 7) = -18
3(-x+7) = -18- -12
3(-x+7) = -30
-x+7 = -30 : 3
-x+7 = -10
-x = -10 -7 = -17
Vậy x= 17
6) 24 : (3x – 2) = -3
( 3x - 2) = 24: -3
3x - 2 = -8
3x = -8 +2
3x = -6
x = -6:3 = -2
Vậy x= -2
7) -45 : 5.(-3 – 2x) = 3
5(-3-2x) = -45: 3
5( -3-2x) = -15
-3-2x = -15 :5
-3- 2x = -3
2x = -3--3
2x= 0
Vậy x= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3^{x+2}-3^x=72\)
\(\Rightarrow3^x\cdot\left(3^2-1\right)=72\)
\(\Rightarrow3^x\cdot\left(9-1\right)=72\)
\(\Rightarrow3^x\cdot8=72\)
\(\Rightarrow3^x=\dfrac{72}{8}\)
\(\Rightarrow3^x=9\)
\(\Rightarrow3^x=3^2\)
\(\Rightarrow x=2\)
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Xem lại đề
![](https://rs.olm.vn/images/avt/0.png?1311)
\(5x-\left(24-2x\right)=\left(-24\right)+20+3x\)
\(5x+\left(-24\right)+2x=\left(-24\right)+20+3x\)
\(7x+\left(-24\right)=\left(-24\right)+20+3x\)
\(7x=20+3x\)
\(\left(7-3\right)x=20\)
\(4x=20\)
\(x=20:4\)
\(x=5\)
5x- (24 - 2x) = -24 + 20 + 3x
5x- 24 + 2x = -4 + 3x
5x + 2x - 3x = 24 - 4
4x = 20
x = 20 \(\div\)4
x = 5
Vậy x = 5
![](https://rs.olm.vn/images/avt/0.png?1311)
3x=24-6+6>3.2
3x=24>6
x=24:3>6
x=8>6
Ai có lòng tốt
cho mình một
tích đúng nhé.
Ta có
\(3x=24-6+6>3\times2\)
\(3x=24>6\)
\(3x=24-6>0\)
\(3x=18>0\)
\(x=6>0\)
Nếu đúng thì k nhé !
![](https://rs.olm.vn/images/avt/0.png?1311)
b,/x-27/=24
TH1 : x - 27 = 24 => x = 51
TH2 : x - 27 = -24 => x = 3
c,/x+8/+12=0
/x+8/=-12
Vì x ko chứa số âm => \(x\in\varnothing\)
d,3/4-x/=21
/4-x/=7
TH1 : 4 - x = 7 => x = -3
TH2: 4 - x = -7 => x = 11
KL :...
\(\Rightarrow3x-16=\dfrac{22\cdot7^{327}}{7^{326}}=22\cdot7=154\\ \Rightarrow3x=170\\ \Rightarrow x=\dfrac{170}{3}\)