什么是胡不归模型---胡不归模型
**模型精讲**
* **图示 (Diagram Description):**
* Type: Geometric figure illustrating a problem and a transformation/solution method.
* **Diagram 1:**
* Line `l` is a horizontal line.
* Points A and Q are on line `l`.
* Point P is outside line `l`.
* Line segments PQ and AQ are drawn, forming triangle PAQ.
* Angle α is indicated at vertex A.
* **Diagram 2 (Transformation/Solution):**
* Line `l` is a horizontal line.
* Point A is on line `l`.
* Point Q' is on line `l`.
* Point P is outside line `l`.
* Line segment PQ' and Q'M are drawn.
* Point M is constructed relative to A and Q. A right triangle AQM is shown with hypotenuse AQ and angle α at A. QM is opposite α.
* Line AC is shown.
* A dashed line PM' is drawn perpendicular to AC at M'.
* PM' intersects line `l` at Q'.
* Labels: A, Q, P, `l`, α, Q', M, M', C. An arrow indicates direction on line `l` from A. Dashed lines PM' and Q'M'.
* **问题 (Problem Stem):**
* 点 A 为直线 `l` 上一定点,点 P 为直线 `l` 外一定点,直线 `l` 上有动点 Q,使得 PQ+kAQ (0