Question

`5/a` = `105/189` = `b/108`

Answer 1

Answer 2

\(\dfrac{5}{a}=\dfrac{105}{189}\Leftrightarrow105.a=5.189\Leftrightarrow105.a=985\Leftrightarrow a=9\)

\(\dfrac{b}{108}=\dfrac{105}{189}\Leftrightarrow b.189=108.105\Leftrightarrow b.189=11340\Leftrightarrow b=60\)

Answer 3

\(\dfrac{5}{a}=\dfrac{105}{189}=\dfrac{b}{108}\)

\(\Rightarrow\left\{{}\begin{matrix}a=\dfrac{189.5}{105}=9\\b=\dfrac{105.108}{189}=60\end{matrix}\right.\)

Vậy a = 9, b = 60

Answer 4

Ta có: \(\dfrac{5}{a}=\dfrac{105}{189}=\dfrac{b}{108}\)

\(\Leftrightarrow\left\{{}\begin{matrix}a=\dfrac{5\cdot189}{105}=9\\b=\dfrac{108\cdot105}{189}=60\end{matrix}\right.\)