\(\dfrac{42}{54}=\dfrac{14}{x}=\dfrac{y}{9}\\ =>\left\{{}\begin{matrix}x=\dfrac{54.14}{42}=18\\y=\dfrac{42.9}{54}=7\end{matrix}\right.\\ =>\dfrac{42}{54}=\dfrac{14}{18}=\dfrac{7}{9}\)
`42/54=(42:3)/(54:3)=14/18=(14:2)/(18:2)=7/9`
\(\dfrac{42}{54}=\dfrac{14}{x}=\dfrac{y}{9}\)
\(x=\dfrac{14\times54}{42}=18\)
\(y=\dfrac{14\times9}{18}=7\)
Ta được dãy:
\(\dfrac{42}{54}=\dfrac{14}{18}=\dfrac{7}{9}\)
ta có :42/54=42:6/54:6=7/9
ta có:7/9=14/...=>...=9x(14:7)=18
7/9=.../9=>...=7x(9:9)=7
=> các số cần điền lần lượt là:18;7
