Bạn tham khảo:
$\dfrac{x}{2}$ $=$ $\dfrac{y}{3}$ $=$ $\dfrac{z}{4}$ $và$ $x$ $+$ $2y$ $-$ $3z$
Ta có : $\dfrac{x}{2}$ $=$ $\dfrac{y}{3}$ $=$ $\dfrac{z}{4}$
$⇒$ $\dfrac{x}{2}$ $=$ $\dfrac{2y}{6}$ $=$ $\dfrac{3z}{12}$
$Áp$ $dụng$ $tính$ $chất$ $dãy$ $tỉ$ $số$ $bằng$ $nhau$ $:$
$\dfrac{x}{2}$ $=$ $\dfrac{2y}{6}$ $=$ $\dfrac{3z}{12}$ = $\dfrac{x+2y-3z}{2+6-12}$ $=$ $5$
$Vì$ $\dfrac{x}{2}$ $=$ $5$ $⇒$ $x$ $=$ $10$
$\dfrac{2y}{6}$ $=$ $5$ $⇒$ $y$ $=$ $15$
$\dfrac{3z}{12}$ $=$ $5$ $⇒$ $z$ $=$ $20$
$Vậy$ $(x;y;z)$ $=$ $(10;15;20)$
Xin hay nhất!
$King$ $Of$ $Rap$
