Question

\(\dfrac{3}{8}\times\dfrac{-5}{7}+\left(\dfrac{-5}{7}\right)\times\dfrac{5}{8}\)

giúp mk với 

Answer 1

`3/8  xx (-5)/7 + (-5/7) xx 5/8`

`= -5/7 xx (3/8+5/8)`

`=-5/7 xx 8/8`

`=-5/7 xx 1`

`=-5/7`

có vẻ hơi sai lớp vs môn nhỉ:<

Answer 2

\(\dfrac{3}{8}.\dfrac{-5}{7}+\left(\dfrac{-5}{7}\right).\dfrac{5}{8}=\dfrac{-5}{7}.\left(\dfrac{3}{8}+\dfrac{5}{8}\right)=\dfrac{-5}{7}.1=\dfrac{-5}{7}\)

Answer 3