$$\(23 O A B\)$$ is a triangle. $$\(C\)$$ is the midpoint of $$\(O A\)$$. $$\(D\)$$ is the point on $$\(A B\)$$ such that $$\(A D: D B=3: 1\)$$ $$\(E\)$$ is the point such that $$\(\overrightarrow{O B}=2 \overrightarrow{B E}\)$$ Using a vector method, prove that the points $$\(C, D\)$$ and $$\(E\)$$ lie on the same straight line.

Answer:

Knowledge points:

Solution: