3.5 x 9.27 x5.3
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( X + 3 ) x 5.3 = 9.01 x 4
( X +3 ) x 5.3 = 36.04
X +3 = 36.04 : 5.3
X +3 = 6.8
X = 6.8 - 3
X = 3.8
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314 : ( 39.27 ) + 52.25 - 43
= 314 : ( 39.33) + 52.25 - ( 22)3
= 314 : 312 + 52.25 - 26
= 32 + 25.(25 - 2)
= 9 + 32.23
= 9 + 736
=745
23.5 - 32.4 + 4.6
= 23.5 - 32.22 + 22.2.3
= 22.( 2.5 - 9 + 2.3)
= 4 .( 10 - 9 + 6 )
= 4 . 7
= 28
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\(9\cdot27\le\left(\dfrac{1}{3}\right)^x\le27\cdot243\)
\(\Leftrightarrow3^5\le\left(\dfrac{1}{3}\right)^x\le3^8\)
\(\Leftrightarrow\left(\dfrac{1}{3}\right)^{-5}\ge\left(\dfrac{1}{3}\right)^x\ge\left(\dfrac{1}{3}\right)^{-8}\)
=>-5>=x>=-8
hay \(x\in\left\{-5;-6;-7;-8\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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56 - 3 ( x + 1) = 42
3( x +1) = 56 - 42
3( x + 1) = 14
x + 1 = 14/3
x = 14/3 - 1
x = 11/3
2/ 12.x - 33 = 9.27
12.x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
56 - 3 ( x + 1) = 42
3( x +1) = 56 - 42
3( x + 1) = 14
x + 1 = 14/3
x = 14/3 - 1
x = 11/3
2/ 12.x - 33 = 9.27
12.x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
Tick đúng nha
![](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)
a)(x-2)5=243
\(\Leftrightarrow\left(x-2\right)^5=3^5\)
\(\Rightarrow x^5=3^5+2^5=5^5\)
\(\Rightarrow x=5\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(9.27\le\left(\frac{1}{3}\right)^x\le27.243\)
\(\Rightarrow243\le\left(\frac{1}{3}\right)^x\le6561\)
\(\Rightarrow\left(\frac{1}{3}\right)^{-5}\le\left(\frac{1}{3}\right)^x\le\left(\frac{1}{3}\right)^{-8}\)
\(\Rightarrow-5\le x\le-8\)
\(\Rightarrow\left\{{}\begin{matrix}x=-5\\x=-6\\x=-7\\x=-8\end{matrix}\right.\)
Vậy \(x\in\left\{-5;-6;-7;-8\right\}.\)
Chúc bạn học tốt!
171.9585.k dùm mk nha :))
=171,9585