1) to find the analytical formula of quadratic function, generally in the first small question, it should be possible.

2) When the image changes, such as there are several points on the quadratic function, find the graphic area formed by these points.

3) Prove a relationship, and perhaps the third question will be the inference of proof.

Usually the last question has three small questions, and the second one is the most difficult.

So if you can't do the second question, you can try the third.

If there is a problem, guess even if you don't know it.

Think about solving problems:

1) geometric techniques should be discussed in categories, so that the logical reasoning ability is better.

2) Algebraic method. If the calculation ability is good, you can choose algebraic method.