1. There is a triangular piece of land, one side of which is adjacent to the canal. Now I'm going to give it to three families, six in A family, three in B family and two in C family. The land is distributed equally according to the population, but the land shared by each family must be adjacent to the canal. How to divide this land?

2. It is known that in △ABC, A, B and C are the lengths of three sides respectively, and the corresponding high lines are h 1, h2 and h3. If a:b:c=5:6:3, find h 1:h2:h3.

3. It is known that points D, E and F are the midpoint of three sides AB, BC and AC of △ABC respectively. Question: Is the area of △DEF equal to the areas of △ADF, △DBE and △FEC? If yes, the derivation process is given.

Good question! Not bad, huh?