Question

1/2 : 3/5 - a/b = 1/7

Answer 1

=>5/6-a/b=1/7

=>a/b=29/42

Answer 2

\(\dfrac{1}{2}:\dfrac{3}{5}-\dfrac{a}{b}=\dfrac{1}{7}\\ \Rightarrow\dfrac{1}{2}\times\dfrac{5}{3}-\dfrac{a}{b}=\dfrac{1}{7}\\ \Rightarrow\dfrac{5}{6}-\dfrac{a}{b}=\dfrac{1}{7}\\ \Rightarrow\dfrac{a}{b}=\dfrac{5}{6}-\dfrac{1}{7}\\ \Rightarrow\dfrac{a}{b}=\dfrac{29}{42}\)

Answer 3

Kết quả là: 

→ 5 phần 6 - a/b = 1 phần 7 

→ a/b = 29 phần 42