\(\dfrac{55}{70}\cdot\dfrac{8}{13}=\dfrac{11}{14}\cdot\dfrac{8}{13}=\dfrac{88}{182}=\dfrac{44}{91}\)
\(\dfrac{55}{70}x\dfrac{8}{13}=\dfrac{11}{14}x\dfrac{8}{13}=\dfrac{88}{182}=\dfrac{44}{91}\)
\(\dfrac{11}{14}X\dfrac{8}{13}=\dfrac{88}{182}=\dfrac{44}{91}\)

trình bày ra

nhờ mn gải giúp 22 23 :))

