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\(\left[3^4-\left(8^2+14\right):13\right]\cdot x=5^3+10^2\)
\(\Rightarrow\left[81-\left(64+14\right):13\right]\cdot x=125+100\)
\(\Rightarrow\left(81-78:13\right)\cdot x=225\)
\(\Rightarrow\left(81-6\right)\cdot x=225\)
\(\Rightarrow75\cdot x=225\)
\(\Rightarrow x=225:75\)
\(\Rightarrow x=3\)
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a ) x ∈ ± 23 28 . b ) x ∈ − 23 6 ; 35 6 . c ) x ∈ − 17 60 ; 97 60 . d ) x ∈ 67 140 ; 143 140 .
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a) x = 1 36 + − 3 4
x = 1 + − 27 36 x = − 26 36 x = − 13 18
b) x = 2 5 + 1 4 + − 1 3
x = 24 + 15 + − 20 60 x = 19 60
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a ) x = 5 4 x = − 5 4 b ) x = 3 2 x = − 1 2 c ) x = 3 2 x = − 1 2
d ) x = 59 40 x = 61 40 e ) x = 1 3 x = − 1 f ) x = 1 3 x = − 1
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a ) x = 19 20 x = 19 20 b ) x = 83 12 x = − 37 12
c ) x = 31 12 x = − 25 12 d ) x = 13 4 x = − 7 12
5x - 14 = x - 34
5x - x = -34 + 14
4x = -20
x = (-20) : 4
x = 5
5x - 14 = x -34
5x - x = 14 - 34
4x = -20
x= -5
Vậy x = -5