Question

x/2 = y/5 ; y/3 = z/4 và 2x + 3y - 2z = 34

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Cảm Ơn <3

 

 

 

 

 

 

 

Answer 1

\(\dfrac{x}{2}=\dfrac{y}{5};\dfrac{y}{3}=\dfrac{z}{4}\Rightarrow\dfrac{x}{6}=\dfrac{y}{15}=\dfrac{z}{20}\)

Áp dụng tc dstbn:

\(\dfrac{x}{6}=\dfrac{y}{15}=\dfrac{z}{20}=\dfrac{2x+3y-2z}{6\cdot2+3\cdot15-2\cdot20}=\dfrac{34}{17}=2\\ \Rightarrow\left\{{}\begin{matrix}x=12\\y=30\\z=40\end{matrix}\right.\)

Answer 2

Lời giải:

$\frac{x}{2}=\frac{y}{5}; \frac{y}{3}=\frac{z}{4}$

$\Rightarrow \frac{x}{6}=\frac{y}{15}=\frac{z}{20}$

Áp dụng TCDTSBN:

$\frac{x}{6}=\frac{y}{15}=\frac{z}{20}$

$=\frac{2x}{12}=\frac{3y}{45}=\frac{2z}{40}=\frac{2x+3y-2z}{12+45-40}=\frac{34}{17}=2$

$\Rightarrow x=2.6=12; y=2.15=30; z=2.20=40$