Question

tính :

a) 1/7 : 5/17 - 3/2 . ( 1/6 - 7/12 )

b) 25/77 - ( 1/5 - 7/15 ) : 10/11 : |-3/4|

Answer 1

a: \(=\dfrac{1}{7}\cdot\dfrac{17}{5}-\dfrac{3}{2}\cdot\dfrac{2-7}{12}\)

\(=\dfrac{17}{35}-\dfrac{-15}{24}\)

\(=\dfrac{17}{35}+\dfrac{15}{24}=\dfrac{311}{280}\)

b: \(=\dfrac{25}{77}-\dfrac{3-7}{15}\cdot\dfrac{10}{11}:\dfrac{3}{4}\)

\(=\dfrac{25}{77}+\dfrac{4}{15}\cdot\dfrac{10}{11}\cdot\dfrac{4}{3}\)

\(=\dfrac{25}{77}+\dfrac{32}{99}=\dfrac{449}{693}\)