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\(3xy-4x+2y=1\Rightarrow x\left(3y-4\right)=1-2y\Rightarrow x=\dfrac{1-2y}{3y-4}\)
-Vì x,y nguyên nên \(\left(1-2y\right)⋮\left(3y-4\right)\)
\(\Rightarrow\left(3-6y\right)⋮\left(3y-4\right)\)
\(\Rightarrow\left(-6y+8-5\right)⋮\left(3y-4\right)\)
\(\Rightarrow-5⋮\left(3y-4\right)\)
\(\Rightarrow3y-4\inƯ\left\{-5\right\}\)
\(\Rightarrow3y-4\in\left\{1;5;-1;-5\right\}\)
\(\Rightarrow y\in\left\{3;1\right\}\)
*\(y=1\Rightarrow x=\dfrac{1-2.1}{3.1-4}=1\)
*\(y=3\Rightarrow x==\dfrac{1-2.3}{3.3-4}=-1\)
\(4\times\left(9x-81\right)=0\)
\(9x-81=0\)
\(9x=0+81\)
\(9x=81\)
\(x=81\div9\)
\(x=9\)
\(\Leftrightarrow x+3\in\left\{1;-1;13;-13\right\}\)
hay \(x\in\left\{-2;-4;10;-16\right\}\)
\(\left(4x+2\right)-\left(3x-4\right)=-2x+9\)
\(\Rightarrow4x+2-3x+4=-2x+9\)
\(\Rightarrow4x-3x+2x=9-2-4\)
\(\Rightarrow3x=3\)
\(\Rightarrow x=3:3=1\)
\(4x:17=0\)
\(4x=0:17\)
\(\Rightarrow x=0\)
\(7x-8=713\)
\(7x=705\)
\(\Rightarrow x=100\frac{5}{7}\)
\(8\left(x-3\right)=0\)
\(8.x-8.3=0\)
\(8x=0+8.3\)
\(8x=24\)
\(\Rightarrow x=3\)
25 – 2x = 16 – 3x
-2x + 3x = 16 - 25
x = -9
Vậy x = -9
x - (47 - 22 ) = 5 + (10-4x)
x - 47 + 22 = 5 + 10 - 4x
x + 4x = 5 + 10 - 22 + 47
5x = 40
x = 40 : 5
x = 8
Vậy x = 8.
~ HOK TỐT ~
\(\text{25 – 2x = 16 – 3x}\)
\(2x+3x=16-25\)
\(5x=-9\)
\(\Rightarrow x=\frac{-9}{5}\)
\(\text{d) x – (47 – 22) = 5+ (10 – 4x)}\)
\(x-47+22=5+10-4x\)
\(x+4x=5+10-22+47\)
\(5x=40\)
\(\Rightarrow x=8\)
học tốt
\(4^3=64\)
\(=>x=3\)
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