The definition of ellipse is the basic content of ellipse chapter, and the examination of this part in the college entrance examination may still focus on the equation of ellipse and the study of ellipse properties, and both kinds of questions may appear. The comprehensive examination proposition of elliptic knowledge and vector knowledge has a strong trend.

Solution of standard equation: The two most commonly used methods of hyperbolic standard equation are definition method and undetermined coefficient method. To solve by definition, we must first be familiar with the definition of hyperbola. As long as the focus of hyperbola and the coordinates of any point on hyperbola are known, the standard equation can be solved by definition.

The second method is to solve hyperbolic equation by undetermined coefficient method, which is one of the basic methods. The idea is to determine the coefficients a and b in hyperbolic equation according to the conditions in the topic, mainly to solve the equation; The third solution is to use * * * focal curve system equation to solve. The key point is to write the conic system equation of * * * focus with one parameter according to one condition in the topic, and then calculate this parameter according to another condition.

More details are as follows:

Area and volume of the ball: To calculate the area and volume of the ball, the radius of the ball is needed. In a specific space geometry, the position of the center of the sphere must be determined first, so that the radius can be calculated according to the known data. When calculating the volume, the space geometry other than the ball cannot be separated from the height. It is necessary to use the correlation theorem between vertical line and plane to determine the height line.

For mathematics, doing more problems is the guarantee of getting high marks in mathematics. But we can't ignore the link of error correction. Many students work hard, but their grades are always not improved, because they just bury themselves in the sea of questions and pay insufficient attention to right and wrong questions.

I did a lot of problems, but I still made mistakes, so I can't improve. While ensuring the number of questions, we must make the wrong questions clear, and it is best to count them several times repeatedly, so that the next time we encounter the same type of questions, we can write them down, and then the sea tactics can truly reflect its charm.