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1) 2x = 1- 3
2x = -2
x = -2 : 2
x = -1
2) 2x = 5 - 3
2x = 2
x = 2 : 2
x = 1
a) \(\left(17x-25\right):8+65=9^2\)
\(\left(17x-25\right).\frac{1}{8}+65=81\)
\(\frac{17}{8}x-\frac{25}{8}=81-65\)
\(\frac{17}{8}x-\frac{25}{8}=16\)
\(\frac{17}{8}x=16+\frac{25}{8}\)
\(\frac{17}{8}x=\frac{128}{8}+\frac{25}{8}\)
\(\frac{17}{8}x=\frac{153}{8}\)
\(x=\frac{153}{8}:\frac{17}{8}\)
\(x=\frac{153}{8}.\frac{8}{17}\)
\(x=\frac{153}{17}\)
\(x=9\)
vay \(x=9\)
b) \(80-\left(4.5^2-3.2^3\right)=2^{10}-\left(x-4\right)\)
\(80-\left(100-24\right)=1024-x+4\)
\(80-76=1028-x\)
\(x=1028-80+76\)
\(x=1024\)
vay \(x=1024\)
\(a,\dfrac{7}{12}-\left(x+\dfrac{7}{10}\right):\dfrac{6}{5}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x-\dfrac{7}{10}:\dfrac{6}{5}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x-\dfrac{7}{12}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x=\dfrac{5}{4}+\dfrac{7}{12}\)
\(\Leftrightarrow\dfrac{7}{12}-x=\dfrac{11}{6}\)
\(\Leftrightarrow x=\dfrac{7}{12}-\dfrac{11}{6}\)
\(\Leftrightarrow\dfrac{-5}{4}\)
Quy ước toán học dấu x = dấu .
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1. (3x - 5)4 = 28
<=> (3x - 5)4 = 44
=> Ta có 2 trường hợp :
* TH1 : \(3^x-5=4\Rightarrow3^x=9\Rightarrow x=2\)
* TH2 : \(3^x-5=-4\Rightarrow3^x=1\Rightarrow x=0\)
Vậy x=1 hoặc x=0
5/12x - 3/2x = 3/8
(5/12 - 3/2)x = 3/8
-13/12x = 3/8
x = 3/8 : -13/12
x = -9/26
5/12xX=15/8
x=15/8:5/12
x=9/2