Question

\(\dfrac{x}{5}=\dfrac{y}{4}=\dfrac{z}{3}\) và x+y+z=36

Answer 1

Áp dụng t/c dtsbn ta có:

\(\dfrac{x}{5}=\dfrac{y}{4}=\dfrac{z}{3}=\dfrac{x+y+z}{5+4+3}=\dfrac{36}{12}=3\)

\(\dfrac{x}{5}=3\Rightarrow x=15\\ \dfrac{y}{4}=3\Rightarrow y=12\\ \dfrac{z}{3}=3\Rightarrow z=9\)

Answer 2

Áp dụng tính chất dãy tỉ số bằng nhau

=> \(\dfrac{x}{5}=\dfrac{y}{4}=\dfrac{z}{3}=\dfrac{x+y+z}{5+4+3}=\dfrac{36}{12}=3\)

=> x = 3.5 = 15

y= 3.4 =12

z= 3.3 = 9