Question

7) a : b : c = 3 : 4 : 5 và a+b+c = 24

Answer 1

\(a:b:c=3:4:5\)

\(\Rightarrow\dfrac{a}{3}=\dfrac{b}{4}=\dfrac{c}{5}\)

Áp dụng t/c dtsbn:

\(\dfrac{a}{3}=\dfrac{b}{4}=\dfrac{c}{5}=\dfrac{a+b+c}{3+4+5}=\dfrac{24}{12}=2\)

\(\Rightarrow\left\{{}\begin{matrix}a=2.3=6\\b=2.4=8\\c=2.5=10\end{matrix}\right.\)