Question

Bài 3

Answer 1

a, Theo hệ quả Ta lét : 

\(\dfrac{AD}{AB}=\dfrac{DE}{BC}\Rightarrow BC=\dfrac{AB.DE}{AD}=\dfrac{1.3}{2}=\dfrac{3}{2}\)

b, Theo hệ quả Ta lét : 

\(\dfrac{FJ}{FH}=\dfrac{JI}{GH}\Rightarrow JI=\dfrac{GH.FJ}{FH}=\dfrac{10.3}{9}=\dfrac{30}{9}=\dfrac{10}{3}\)