Question

tính nhanh:

-13/8.(8/13+32/28)-15/7

Answer 1

=\(\dfrac{-13}{8}\times(\dfrac{8}{13}+\dfrac{32}{28})-\dfrac{15}{7}\)

=\(\dfrac{-13}{8}\times\dfrac{8}{13}+\dfrac{32}{28}\times\dfrac{-13}{8}-\dfrac{15}{7}\)

=\(-1+(\dfrac{-13}{7})-\dfrac{15}{7}\)

=\(-1+\left(-4\right)=-5\)

Answer 2

giúp mình ik mà,đúng tim cho