Question

Giúp mình nha, mình cần gấp

Answer 1

\(-\dfrac{3}{5}\times\dfrac{5}{7}+\dfrac{-3}{5}\times\dfrac{4}{7}+\dfrac{-3}{5}\times\dfrac{6}{7}\)

\(=-\dfrac{3}{5}\times\left(\dfrac{5}{7}+\dfrac{4}{7}+\dfrac{6}{7}\right)\)

\(=-\dfrac{3}{5}\times\dfrac{15}{7}=-\dfrac{9}{7}\)

Answer 2