It is carrier with function, it is a tool with derivative, check function property and derivative application are a target, it is function of the last few years and derivative make the marked characteristic that collects examination questions and propositional run. Applying derivative to decide the parameter that contains parameter function takes value scope is a kind of common exploration sex problem, basically be the limits of the parameter in begging existence sex problem or constant to establish a problem.
Solve this kind of problem, basically be the mathematical idea that uses equivalence to change, through be being changed ceaselessly, not familiar, non-standard, complex problem translate into familiar, standard even mode is changed, simple question.
Settlement main avenue
Establish the existence sex that contains parameter inequality or constant problem foundation the structural feature of its inequality, appropriate tectonic function, equal in value translate into: Those who contain ginseng function most value discussion.
One, the existence sex problem in containing ginseng function
Use a problem to set a condition to be able to communicate place to beg the connection between parameter, build equation or inequality (group) seek solution. This is to seek a means with the most obvious question of existence sex limits.
2, the constant in containing ginseng function establishs a problem
Can use a problem to set a condition to establish variable relation first, demand place variable and depart of another foregone variable, get function concerns, make this kind has the limits problem be readily solved of function setting thereby, beg the value territory that gives function by the limits of foregone variable again, seek variable range for place namely.
Type:
High school effort of 3 years is to can take an examination of a good university, if achievement differs bigger, can learn ahead of schedule " mad the 600 note that carry fraction " inside skill of problem having solution, answering question skill, and knowledge of 9 big headings in an account book checks a place, attack the university entrance exam to check a place continuously!
(Know in 1) double parameter among them the limits of a parameter;
(The limits in 2) double parameter all sealed.
