(-13) : 2.x -3 bằng bao nhiêu ạ
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Ta có: \(\dfrac{4}{15}\) + \(\dfrac{2}{13}\) = \(\dfrac{52+30}{195}\) = \(\dfrac{82}{195}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
chiều rộng là : \(\dfrac{200\times3}{4}=150\left(m\right)\\ S:200\times150=30000\left(m^2\right)=3ha\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a^2.a^3.a^7.b^2.b\)
\(=a^{2+3+7}.b^{2+1}\)
\(=a^{12}.b^3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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213 : 22x = 23
22x = 213 : 23
22x = 210
=> 2x = 10
x = 10 : 2
x = 5
213:22x = 23
213-2x = 23
13 - 2x = 3
2x = 13 - 3
2x = 10
x= 10 : 2
x= 5
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\left|2x\right|=x+3\)
\(\Leftrightarrow\left[{}\begin{matrix}2x=x+3\left(x\ge0\right)\\-2x=x+3\left(x< 0\right)\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}2x-x=3\\-2x-x=3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\left(nhận\right)\\x=-1\left(nhận\right)\end{matrix}\right.\)
Vậy: S={3;-1}
![](https://rs.olm.vn/images/avt/0.png?1311)