Question

Tìm a,b biết 12/16=a/20=9/b

Answer 1

\(\left\{{}\begin{matrix}a=\dfrac{12.20}{16}=15\\b=\dfrac{16.9}{12}=12\end{matrix}\right.\)

Answer 2

\(\dfrac{12}{16}=\dfrac{a}{20}=\dfrac{9}{b}\)

\(a=\dfrac{12\times20}{16}=15\)

\(\text{Vậy a = 15}\)

\(\dfrac{12}{16}=\)\(\dfrac{15}{20}=\dfrac{9}{b}\)

\(b=\dfrac{20\times9}{15}=12\)

\(\text{Vậy b = 12}\)

\(\dfrac{12}{16}=\dfrac{15}{20}=\dfrac{9}{12}\)