Solving math problems in senior high school. .

Solution: Use vector method. Let the vector m= (root number (1-x), root number (x+3)), n = (2, 1), and a =

Then | m | = 2, | n | = radical number 5, y = m * |n|= | m || n | COSA = 2 radical number 5cosa, the end point m corresponds to the vector m (starting point is the coordinate origin o), and m is located on a circle with the first quadrant o as the center and the radius of 2.

Draw a picture, it is easy to know that A belongs to [0, arccos 1/ radical number 5 = = > y = 2, the maximum value of radical number 5, and the minimum value of y is ymin=2.

The function value domain is: 2

Note: Vector is one of our tools to solve mathematical problems. It can be used to solve many mathematical problems.

I'm not good at math. What should I do? (If it is good, there will be reward points. )

Gold content of Guangdong seedling cup mathematics competition

N definite integrals of trigonometric functions

Modern world famous mathematician?

The History of Mathematics and the Experience of Mathematics Teaching in Senior High School

Senior one uses 1- 10 to form a sentence. 10 what, 9 what is connected like this.

Distribution of examination subjects and scores in management joint examination

How to write the speech of the parent representative at the parent-teacher conference?

What should I do if I can't finish a real problem for three hours at a time? If you can complete it, you can generally get about 145 points.

Mathematical application problems in the first volume of the second grade of primary school