\(\dfrac{1}{2}:\dfrac{3}{5}-\dfrac{a}{b}=\dfrac{1}{7}\\ \Rightarrow\dfrac{1}{2}\times\dfrac{5}{3}-\dfrac{a}{b}=\dfrac{1}{7}\\ \Rightarrow\dfrac{5}{6}-\dfrac{a}{b}=\dfrac{1}{7}\\ \Rightarrow\dfrac{a}{b}=\dfrac{5}{6}-\dfrac{1}{7}\\ \Rightarrow\dfrac{a}{b}=\dfrac{29}{42}\)
Kết quả là:
→ 5 phần 6 - a/b = 1 phần 7
→ a/b = 29 phần 42