According to my feeling, I am not so good at watching computers do problems. These two books are very good. Basically, every problem has a function problem recently.

1. Analytic formula This is very simple.

2. Maximum value (two general cases. 1. Find the minimum value from two points to that point. 2. Find the maximum difference between two points and the coordinate axis. The practice is the same. The point where the symmetrical line intersects the coordinate axis is the point you want.

This is the most complicated, but if you do more, you will find that the nature of the topic is still the same.

Tian Li 38 sets 19.80 yuan. I hope you can get good grades in the middle school entrance examination (buy it and don't do it)

Hope to adopt Roy