Current location - Training Enrollment Network - Mathematics courses - How to find the maximum value and minimum value by collocation method in junior high school mathematics?
How to find the maximum value and minimum value by collocation method in junior high school mathematics?
Use the matching method. Is to change this score into () *n+,,,,

It should be said that the score has only a maximum value or a minimum value, because, for example,

Mixed x 2+2x+3 formula

=x^2+2x+ 1+2

=(x+ 1)^2+2

Judging from the result of this formula. This score has a minimum, because (x+ 1) 2 has a minimum, and "+2".

"Don't allow to change.

That is, when x=- 1, it is also the minimum value of this score, which is 2.

No matter what the score is. Just transform according to the idea of complete square, transform a complete square, and add a series of Dongdong numbers to make it equal to the original score.