\(2a=4b\Rightarrow\dfrac{a}{4}=\dfrac{b}{2}\Rightarrow\dfrac{a}{20}=\dfrac{b}{10};3b=5c\Rightarrow\dfrac{b}{5}=\dfrac{c}{3}\Rightarrow\dfrac{b}{10}=\dfrac{c}{6}\\ \Rightarrow\dfrac{a}{20}=\dfrac{b}{10}=\dfrac{c}{6}\)
Áp dụng t/c dtsbn:
\(\dfrac{a}{20}=\dfrac{b}{10}=\dfrac{c}{6}=\dfrac{2b}{20}=\dfrac{3c}{18}=\dfrac{a+2b-3c}{20+20-18}=\dfrac{99}{22}=\dfrac{9}{2}\\ \Rightarrow\left\{{}\begin{matrix}a=90\\b=45\\c=27\end{matrix}\right.\)
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