Which is better to focus on in the four questions of the rematch of the senior high school mathematics competition? How to learn elementary number theory? Why do you feel that you can't start when you start inequality? Three problems in algebra and one problem in geometry.

In algebra,

1 number theory is mostly about solving indefinite equations.

The most polynomial is the flexible application of Vader theorem.

Inequality is, of course, a proof problem at best.

Geometric problems generally revolve around the properties of a circle.

In fact, it is not difficult to test number theory. You must always know the basic knowledge (divisibility, greatest common multiple, basic theorem of algebra, several number theory functions, etc.). ), some skills to solve indefinite equations, and then how to judge prime numbers and square numbers.

In fact, inequality is the most important test of mathematical literacy, and it really can't be improved at once. In general, the proof problem first considers the condition of the equal sign, which sometimes becomes a breakthrough, and then observes the feasible deformation skills of formula association. If you can't prove it with some beautiful skills, don't be afraid. We wait patiently for exploration, classified discussion, value exploration, finding the critical point and so on are all good ways to further understand the problem and even solve it.