Question

Answer 1

mờ quá bạn ơi chụp lại đi hoặc vt trên máy đấy

 

Answer 2

\(-\dfrac{5}{12}\cdot\dfrac{6}{7}+\dfrac{7}{12}\left(-\dfrac{3}{14}\right)\)

\(=\dfrac{1}{12}\cdot\left(\dfrac{-5\cdot6}{7}+\dfrac{7\cdot\left(-3\right)}{14}\right)\)

\(=\dfrac{1}{12}\cdot\left(-\dfrac{81}{14}\right)=-\dfrac{27}{56}\)

Answer 3

\(\dfrac{-5}{12}\) . \(\dfrac{6}{7}\) + \(\dfrac{7}{12}\) .\(\left(\dfrac{-3}{14}\right)\) 

=\(\dfrac{-5}{14}\) + \(\dfrac{-1}{8}\) 

=\(\dfrac{-27}{56}\)