Ta có \(\left(\dfrac{a}{b}\right)^3=\dfrac{1}{1000}\)
\(\Rightarrow\left(\dfrac{a}{b}\right)^3=\left(\dfrac{1}{10}\right)^3\)
\(\Rightarrow\dfrac{a}{b}=\dfrac{1}{10}\)
\(\Rightarrow\dfrac{a}{1}=\dfrac{b}{10}\)
Áp dụng tính chất dãy tỉ số bằng nhau
\(\dfrac{a}{1}=\dfrac{b}{10}=\dfrac{b-a}{10-1}=\dfrac{36}{9}=4\)
\(\Rightarrow\dfrac{a}{1}=4\Rightarrow a=4.1=4\)
\(\dfrac{b}{10}=4\Rightarrow b=4.10=40\)
Vậy a=4, b=40