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f) (2x - 8)(4x + 16) = 0
<=> 2x - 8 = 0 hoặc 4x + 16 = 0
<=> 2x = 0 + 8 hoặc 4x = 0 - 16
<=> 2x = 8 hoặc 4x = -16
<=> x = 4 hoặc x = -4
g) 5x(6x - 12) = 0
<=> 5x = 0 hoặc 6x - 12 = 0
<=> x = 0 hoặc 6x = 0 + 12
<=> x = 0 hoặc 6x = 12
<=> x = 0 hoặc x = 2
h) 7(9 - x)(12 - 6x) = 0
<=> 9 - x = 0 hoặc 12 - 6x = 0
<=> -x = 0 - 9 hoặc -6x = 0 - 12
<=> -x = -9 hoặc -6x = -12
<=> x = 9 hoặc x = 2
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(6x - 48)(72 - 9x) = 0
6x - 48 = 0 hoặc 72 - 9x = 0
*) 6x - 48 = 0
6x = 48
x = 48 : 6
x = 8
*) 72 - 9x = 0
9x = 72
x = 72 : 9
x = 8
Vậy x = 8
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X x 13 = 39
X = 39 : 13
X = 3
( x - 15 ) - 75 = 0
x - 15 = 0 + 75
x - 15 = 75
x = 75 + 15
x = 90
6x - 39 = 201
6x = 201 + 39
6x = 240
x = 40
X x 13 = 39
X = 39 : 13
X = 3
( x - 15 ) - 75 = 0
x - 15 = 0 + 75
x - 15 = 75
x = 75 + 15
x = 90
6x - 39 = 201
6x = 201 + 39
6x = 240
x = 240 : 6
x = 40
575 - ( 6x +70 ) = 445
6x + 70 = 575 - 445
6x + 70 = 130
6x = 130 - 70
6x = 60
x = 60 : 6
x = 10
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\(\left(6x+12\right)\left(-x-3\right)=0\)
\(\Rightarrow\left[6\cdot\left(x+2\right)\right]\cdot\left[-\left(x+3\right)\right]=0\)
\(\Rightarrow-6\left(x+2\right)\left(x+3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x+2=0\\x+3=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=-2\\x=-3\end{matrix}\right.\)
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\(\Rightarrow\left(x-2\right)\left(x+2\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)
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\(\left(x^2-4\right)\left(-6x+6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x^2-4=0\\-6x+6=0\end{cases}}\Rightarrow\orbr{\begin{cases}x^2=4\\-6x=-6\end{cases}}\Rightarrow\orbr{\begin{cases}x=\pm2\\x=1\end{cases}}\)
Vậy \(x\in\left\{\pm2;1\right\}\)
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\(\left(x^2-4\right)\left(-6x+6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x^2-4=0\\-6x+6=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\pm2\\x=1\end{cases}}}\)
Vậy \(x=\pm2\)hoặc \(x=1\)
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