1, be familiar with the relationship between images and coefficients of linear function, quadratic function and inverse proportional function, draw a sketch according to the analytical formula, and find the analytical formula by undetermined coefficient method. According to the analytical formula, the coordinates of several special points (intersection with coordinate axis, vertex of parabola and axis of symmetry) can be accurately expressed.

2. When analyzing, we must carefully examine the meaning of the question and combine numbers with shapes.

3. When you meet a moving point, you should seek quietness while moving. The grasping distance (that is, the length of the line segment) is equal to the speed multiplied by the time. After t is used to represent the length of the outgoing line, the equation is formulated by combining the properties of geometric figures.

The above is for reference only.