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How to deduct points from the three small questions of Anhui big question 14 in the senior high school entrance examination mathematics?
Step-by-step rating: 3 points, 4 points and 7 points.

Give some to others and deduct the rest.

Geometric synthesis problem: firstly, the geometric figure is given and calculated according to the known conditions, and then the moving point (or moving line segment) moves, resulting in the change of line segment and area, and then the analytical formula of the corresponding (unknown) function is obtained. Find the value range of function independent variables, and finally explore and learn according to the function relationship.