318 x 244 / 184 x 95
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3^x+3^{x+1}+3^{x+2}=117\)
\(3^x\left(1+3+3^2\right)=117\)
\(3^x=\dfrac{117}{13}=9=3^2\)
\(\Rightarrow x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(3^x+3^{x+1}+3^{x+2}=117\)
\(\Leftrightarrow3^x+3^x.3+3^x.3^2=117\)
\(\Leftrightarrow3^x\left(1+3+3^2\right)=117\)
\(\Leftrightarrow3^x.13=117\Leftrightarrow3^x=9\Leftrightarrow3^x=3^2\)
\(\Leftrightarrow x=2\)
Vậy...
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có \(x^2\ge0;\left|x-1\right|\ge0\)
\(\Rightarrow x^2+\left|x-1\right|\ge0\)
\(\Rightarrow\) |x2 + |x-1|| = x2+|x-1|
\(\Rightarrow x^2+\left|x-1\right|=x^2+2\Leftrightarrow\left|x-1\right|=2\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=2\\x-1=-2\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-1\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Delta ABC=\Delta HIK\)
\(\Rightarrow\left\{{}\begin{matrix}AB=HI;BC=IK;AC=HK\\\widehat{A}=\widehat{H};\widehat{B}=\widehat{I};\widehat{C}=\widehat{K}\end{matrix}\right.\)
như vậy ta có thể suy ra được:
\(HI=2cm;IK=40cm;\widehat{I}=40^0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A C B H I K
a, Cạnh tương ứng với canh BC là cạnh IK
Góc tương ứng với góc H là góc : góc A
b, các cạnh bằng nhau là: AB = HI; AC = HK ; BC = IK
các cặp góc bằng nhau là: góc A = góc H; góc B = góc I; góc C = góc K
![](https://rs.olm.vn/images/avt/0.png?1311)
mình cứ xét riêng từng cái 1 nhé
\(\dfrac{0,8:\left(\dfrac{4}{5}.1,25\right)}{0,65-\dfrac{1}{25}}=\dfrac{0,8:1}{0,61}=\dfrac{80}{61}\)
\(\dfrac{\left(1,08-\dfrac{2}{25}\right):\dfrac{4}{7}}{\left(6\dfrac{5}{9}-3\dfrac{1}{4}\right).2\dfrac{2}{17}}+\left(1,2.0,5\right):\dfrac{-4}{5}=\dfrac{1:\dfrac{4}{7}}{\dfrac{119}{36}.\dfrac{36}{17}}+\dfrac{3}{5}:\left(-\dfrac{4}{5}\right)\)
\(=\dfrac{\dfrac{7}{4}}{7}+-\dfrac{3}{4}=\dfrac{23}{2}\)
cộng và ta có KQ:/1563/122
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{3^{18}.24^4}{18^4.9^5}=\dfrac{3^{18}.6^4.4^4}{3^4.6^4.\left(3^2\right)^5}\\ =\dfrac{3^{18}.6^4.4^4}{3^4.6^4.3^{10}}\\ =\dfrac{3^{18}.6^4.4^4}{3^{14}.6^4}=3^4.4^4=12^4\)
\(\dfrac{3^{18}.24^4}{18^4.9^5}=\dfrac{3^{18}.3^4.8^4}{9^4.2^4.9^5}=\dfrac{3^{22}.\left(2^3\right)^4}{\left(3^2\right)^9.2^4}=\dfrac{3^{22}.2^{12}}{3^{18}.2^4}=3^4.2^8\)