Question

Giúp mình với

Answer 1

\(-\dfrac{8a}{b\cdot a}=\dfrac{24}{45}\)

\(\Leftrightarrow\dfrac{-8}{b}=\dfrac{24}{45}\)

\(\Leftrightarrow b=-15\)

\(-8a=24\)

\(\Leftrightarrow a=-3\)

\(\Rightarrow A\)

Answer 2

A

Answer 3

\(\dfrac{-8.a}{b.a}=\dfrac{24}{45}\)                 (1)

⇒\(-8.a=24\)

\(a=24:-8\)

\(a=-3\)                        (2)

Thay (2) vào (1), ta có: \(\dfrac{-8.3}{b.3}=\dfrac{24}{45}\)

\(\dfrac{-24}{b.3}=\dfrac{24}{45}\)

⇒\(b.3=45\)

\(b=45:3\)

\(b=15\)

Chọn B

Answer 4

Thank nha !!!!