x-50=135
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Mk giải câu 1 nha
1) 2x - 3 = x + 1/2
➡️2x - x = 1/2 + 3
➡️x = 7/2
Hok tốt~
![](https://rs.olm.vn/images/avt/0.png?1311)
\(72-x=50\\ \Rightarrow x=22\)
\(2x-138=72\\ \Rightarrow2x=210\\ \Rightarrow x=105\)
\(5.3^x=135\\ \Rightarrow3^x=27\\ \Rightarrow3^x=3^3\\ \Rightarrow x=3\)
72−x=50⇒x=2272−x=50⇒x=22
2x−138=72⇒2x=210⇒x=1052x−138=72⇒2x=210⇒x=105
5.3x=135⇒3x=27⇒3x=33⇒x=3
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=2008-\dfrac{2}{135}+\dfrac{1}{50}-1+\dfrac{7}{135}-\dfrac{4}{50}-5-\dfrac{5}{135}-\dfrac{3}{50}\)
\(=2002\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(2018-\frac{2}{135}+\frac{1}{50}\right)-\left(1-\frac{7}{135}+\frac{4}{50}\right)-\left(5+\frac{5}{135}+\frac{3}{50}\right)\)
\(=2018-\frac{2}{135}+\frac{1}{50}-1+\frac{7}{135}-\frac{4}{50}-5-\frac{5}{135}-\frac{3}{50}\)
\(=2012-\frac{6}{50}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
25 x 15 + 25 x 135 - 50 x 25
=375+3375-1250
=2500
T lời đúng nha, cho mk nhé!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
a: 17-2x=9
=>2x=17-9=8
=>x=8/2=4
b: \(145-135\left(x-2\right)^2=10\)
=>\(135\cdot\left(x-2\right)^2=135\)
=>\(\left(x-2\right)^2=1\)
=>\(\left[{}\begin{matrix}x-2=1\\x-2=-1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)
c: \(x\inƯ\left(36\right)\)
=>\(x\in\left\{1;-1;2;-2;3;-3;4;-4;6;-6;9;-9;12;-12;18;-18;36;-36\right\}\)
mà x>12
nên \(x\in\left\{18;36\right\}\)
d: \(x-1\in B\left(9\right)\)
=>\(x-1\in\left\{0;9;18;27;36;45;54;...\right\}\)
=>\(x\in\left\{1;10;19;28;37;46;55;...\right\}\)
mà 25<x<50
nên \(x\in\left\{28;37;46\right\}\)
x=135+50=185
x-50=135
x =135-50
x =85
ai k minh k lai