Question 1: v2 represents the area of a right triangle with root number 2 = 1/2*v2*v2= 1.

BC=2, because BD/DC= 1/2, so? BD=2/3，DC=4/3，

Let the height of triangle CDE be x? Then 1/2*x*4/3= 1/5, so x=3/ 10, so AE/EC=7/3.