Question

Help me, plz!@!

Answer 1

bài 1)

a)\(\dfrac{-1}{39}+\dfrac{-1}{52}\)

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

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

b)\(\dfrac{-6}{9}+\dfrac{-12}{16}\)

\(=\dfrac{-96}{144}+\dfrac{-108}{144}\)

\(=\dfrac{-204}{144}\)

\(=\dfrac{-17}{12}\)

Answer 2

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

b) \(\dfrac{-6}{9}+\dfrac{-12}{16}=\dfrac{-2}{3}+\dfrac{-3}{4}=\dfrac{-8}{12}+\dfrac{-9}{12}=\dfrac{-17}{12}\)