Question

Tính:
\(\dfrac{-1}{39}+\dfrac{-1}{52}\)

Answer 1

\(\dfrac{-1}{39}+\dfrac{-1}{52}=\dfrac{-4-3}{156}=-\dfrac{7}{156}\)

Answer 2

\(\dfrac{-52}{2028}+\dfrac{-39}{2028}=\dfrac{-7}{156}\)

Answer 3

\(=\dfrac{-4}{156}-\dfrac{3}{156}=\dfrac{-7}{156}\)

Answer 4

=\(\dfrac{-7}{156}\)