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Ta có:\(\frac{3x-2y}{4}=\frac{2z-4x}{3}=\frac{4y-3z}{2}\)
=> \(\frac{12x-8y}{16}=\frac{6z-12x}{9}=\frac{8y-6z}{4}\)
Áp dụng tính chất dãy tỉ số bằng nhau ta có:
\(\frac{12x-8y}{16}=\frac{6z-12x}{9}=\frac{8y-6z}{4}\)\(=\frac{12x-8y+6z-12x+8y-6z}{16+9+4}\)\(=\frac{0}{29}=0\)
=>\(\hept{\begin{cases}12x-8y=0\\6z-12x=0\\8y-6z=0\end{cases}}\)=>\(\hept{\begin{cases}12x=8y\\6z=12x\\8y=6z\end{cases}}\)
=> 12x=8y=6z
=> \(\frac{12x}{24}=\frac{8y}{24}=\frac{6z}{24}\)=>\(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)=>\(\frac{x^2}{4}=\frac{4y^2}{36}=\frac{3z^2}{48}\)
Áp dụng tính chất dãy tỉ số bằng nhau ta có:
\(\frac{x^2}{4}=\frac{4y^2}{36}=\frac{3z^2}{48}\)\(=\frac{x^2-4y^2+3z^2}{4-36+48}\)\(=\frac{1}{16}\)
=>x2=1/4 =>x={-1/4 ; 1/4}
-x=-1/4 => \(\hept{\begin{cases}y=-\frac{3}{8}\\z=-\frac{1}{2}\end{cases}}\) -x=1/4 =>\(\hept{\begin{cases}y=\frac{3}{8}\\z=\frac{1}{2}\end{cases}}\)
\(\dfrac{3x-2y}{4}=\dfrac{4y-3z}{2}=\dfrac{2z-4x}{3}=\dfrac{12x-8y}{16}=\dfrac{6z-12x}{9}=\dfrac{8y-6z}{4}=\dfrac{12x-8y+6z-12x+8y-6z}{16+9+4}=\dfrac{0}{29}=0\\ \Leftrightarrow\left\{{}\begin{matrix}3x-2y=0\\2z-4x=0\\4y-3z=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}\dfrac{x}{2}=\dfrac{y}{3}\\\dfrac{y}{3}=\dfrac{z}{4}\\\dfrac{z}{4}=\dfrac{x}{2}\end{matrix}\right.\\ \Leftrightarrow\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{4}=\dfrac{x-2y+3z}{2-6+12}=\dfrac{8}{8}=1\\ \Leftrightarrow\left\{{}\begin{matrix}x=2\\y=3\\z=4\end{matrix}\right.\)
=\(\frac{4\left(3x-2y\right)}{4^2}\)=\(\frac{3\left(2z-4x\right)}{3^2}\)=\(\frac{2\left(4y-3z\right)}{2^2}\)
= \(\frac{12x-8y}{16}\)=\(\frac{6z-12x}{9}\)=\(\frac{8y-6z}{4}\)
=\(\frac{12x-8y+6z-12x+8y-6z}{16+9+4}\)
=\(\frac{0}{29}\)
=0
+) \(\frac{3x-2y}{4}\)=0 => 3x-2y=0 => 3x=2y => \(\frac{x}{2}\)=\(\frac{y}{3}\) (1)
+) \(\frac{2z-4x}{3}\)=0 => 2z-4x=0 =>2z=4x => \(\frac{z}{4}\)=\(\frac{x}{2}\) (2)
Từ (1) và (2) => \(\frac{x}{2}\)=\(\frac{y}{3}\)=\(\frac{z}{4}\)
tick mình nha
\(\frac{3x-2y}{4}=\frac{2z-4x}{3}=\frac{4y-3z}{2}=\frac{4\cdot\left(3x-2y\right)}{16}=\frac{3\cdot\left(2z-4x\right)}{9}=\frac{2\cdot\left(4y-3z\right)}{4}=\)
\(=\frac{12x-8y}{16}=\frac{6z-12x}{9}=\frac{8y-6z}{4}=\frac{12x-8y+6z-12x+8y-6z}{16+9+4}=0\)
\(\Rightarrow3x-2y=0\Rightarrow\frac{x}{2}=\frac{y}{3}\left(1\right)\)
\(\Rightarrow2z-4x=0\Rightarrow z=2x\Rightarrow\frac{x}{2}=\frac{z}{4}\left(2\right)\)
Từ (1) và (2) => \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)đpcm
Note: Nếu bạn đã HỎI hãy có trách nhiệm khi được TRẢ LỜI
\(\frac{4\left(3x-2y\right)}{16}=\frac{3\left(2z-4x\right)}{9}=\frac{2\left(4y-3z\right)}{4}=\frac{12x-8y+6z-12x+8y-6z}{16+9+4}=\frac{0}{29}=0\)
\(\Leftrightarrow3x-2y=0\Leftrightarrow\frac{x}{2}=\frac{y}{3}\)
\(\Leftrightarrow2z-4x=0\Leftrightarrow\frac{x}{2}=\frac{z}{4}\)
\(\Leftrightarrow\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)
\(\Leftrightarrow\frac{x}{2}=\frac{y}{3}=\frac{z}{4}=\frac{2x+4y+5z}{4+12+20}=\frac{8}{36}=\frac{2}{9}=\frac{2x+3y-z}{4+12-4}\)=> A= 2x+3y -z = 12.2/9 =8/3
Ta có : \(\frac{3x-2y}{4}=\frac{4y-3z}{2}=\frac{2z-4x}{3}\)
\(\Leftrightarrow\frac{12x-8y}{16}=\frac{8y-6z}{4}=\frac{6z-12x}{9}\)
Áp dụng tính chất dãy tỉ số bằng nhau ta có :
\(\frac{12x-8y}{16}=\frac{8y-6z}{4}=\frac{6z-12x}{9}=\frac{12x-8y+8y-6z+6z-12x}{16+4+9}=0\)
\(\Leftrightarrow\hept{\begin{cases}\frac{3x-2y}{4}=0\\\frac{4y-3z}{2}=0\\\frac{2z-4x}{3}=0\end{cases}}\) \(\Leftrightarrow\hept{\begin{cases}3x=2y\\4y=3z\\2z=4x\end{cases}}\) \(\Leftrightarrow\hept{\begin{cases}\frac{x}{2}=\frac{y}{3}\\\frac{y}{3}=\frac{z}{4}\\\frac{x}{2}=\frac{z}{4}\end{cases}}\) \(\Leftrightarrow\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)
\(\Leftrightarrow\frac{x}{2}=\frac{2y}{6}=\frac{3z}{12}\)
Áp dụng tính chất dãy tỉ số bằng nhau ta có :
\(\frac{x}{2}=\frac{2y}{6}=\frac{3z}{12}=\frac{x-2y+3z}{2-6+12}=\frac{8}{8}=1\)
\(\Leftrightarrow\hept{\begin{cases}\frac{x}{2}=1\\\frac{y}{3}=1\\\frac{z}{4}=1\end{cases}\Leftrightarrow}\hept{\begin{cases}x=2\\y=3\\z=4\end{cases}}\)
Vậy : \(\left(x,y,z\right)=\left(2,3,4\right)\)
x=2
y=3
z=4