Question

Tính

\(\dfrac{ }{ }\)a, -4/7-5/13.-39/25+-1/42:(-5/6)

b,   2/9.[-4/45:(1/5-2/15)+1 2/3]-5/27

Answer 1

a: \(-\dfrac{4}{7}-\dfrac{5}{13}\cdot\dfrac{-39}{25}+\dfrac{-1}{42}:\dfrac{-5}{6}\)

\(=\dfrac{-4}{7}+\dfrac{3}{5}+\dfrac{1}{35}\)

\(=\dfrac{-20}{35}+\dfrac{21}{35}+\dfrac{1}{35}\)

\(=\dfrac{2}{35}\)