Hey diuu

Diu đánh loại đàn j v ạ .:3

2

a) \(\dfrac{-8}{9}:\dfrac{4}{3}=\dfrac{-8}{9}.\dfrac{3}{4}=\dfrac{\left(-8\right).3}{9.4}=\dfrac{-24}{36}=\dfrac{-2}{3}\)

b) \(\left(-2\right):\dfrac{3}{5}=\left(-2\right).\dfrac{5}{2}=\dfrac{\left(-2\right).5}{2}=\dfrac{-10}{2}=-5\)

a) \(\dfrac{-1}{13}+\dfrac{9}{13}=\dfrac{\left(-1\right)+9}{13}=\dfrac{8}{13}\)

b) \(\dfrac{-3}{8}+\dfrac{5}{12}=\dfrac{-9}{24}+\dfrac{10}{24}=\dfrac{\left(-9\right)+10}{24}=\dfrac{1}{24}\)