Question

a-b=\(\dfrac{a}{b}\)=2

Answer 1

Có \(\dfrac{a}{b}=2\Rightarrow a=2b\)

Mà a-b=2

\(\Rightarrow2b-b=2\Rightarrow b=2\Rightarrow a=2+2=4\)

Answer 2

\(\dfrac{a}{b}=2\)

\(\Rightarrow\) \(\dfrac{a}{2}=\dfrac{b}{1}\)

Áp dụng tính chất dãy tỉ số bằng nhau, ta có:
\(\dfrac{a}{2}=\dfrac{b}{1}=\dfrac{a-b}{2-1}=\dfrac{2}{1}=2\)

\(\Rightarrow\left\{{}\begin{matrix}a=2.2\\b=2.1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a=4\\b=2\end{matrix}\right.\)

Vậy, a = 4; b = 2

Answer 3

tìm a; b à