This topic mainly investigates the similarity and similar graphic properties of triangles. (2) (2) is a very novel test center to test candidates' understanding of the function itself. As an unknown function type, it is very necessary for students to explore its changing trend. Generally speaking, this question is very good and new. It's a five-star problem, and it's really the finale of the senior high school entrance examination. Here are the answers. Look, if you don't know, you can keep asking.

The answer is here/exercise/math /798746 right-angled ABCD, AB=20, BC= 10, point P is a moving point on the side of AB, and DP intersects AC at point Q. 。

(1) Verification: △ apq ∽△ cdq;

(2) Point P starts from Point A and moves along the AB side to Point B at a speed of/kloc-0 per unit length per second for t seconds.

(1) when t is what value, DP⊥AC?

② Let S△APQ+S△DCQ=y, write the resolution function between y and t, and explore the minimum value of y when point P moves from the first few seconds to the second. The point is that you can search for any questions that you can't do in the future. Come on ~