What are the examination skills for junior high school students to participate in the junior high school mathematics science competition held by senior high school? Or what formulas may be taken out in high school? Let me tell you. First of all, your personal strength. If you know the formula like the back of your hand, take the test according to your own model. If you get stuck many times, you'd better use sparrow tactics and step on more points. Useful formulas, introduce some commonly used formulas: basic inequality+Cauchy inequality+Helen theorem+Poirot theorem+some column formulas of sequence. These are the foundations, as well as euler theorem's and Menelaus's theorems. In fact, after all, this kind of competition questions should sum up some tips, such as midpoint, similarity and equal division (guessing, the conditions were not given, and I didn't prove it myself). In fact, people who have seen NB can learn derivatives and calculus in the third grade. You compare some theorems familiar in high school with others. Can you compete with them? Well, the best way is to study with the teacher for a long time, and then do a lot of problems by yourself. That's it.