2. coordinate representation of plane vector * * * line: let a=(x 1, y 1)b=(x2, y2) where b≠0, then the lines of a and b*** < = > a = λ b ≠ 0 <; = & gtx 1y2-x2y 1=0

3. geometric expression A b = | A || B | COS

Coordinates indicate a b = a b=a 1b 1 a2b2.

4. In △ABC, when m is the midpoint of BC, AM= 1/2(AB AC) should be recorded as a formula.

5. Prove the three-point * * * line problem: Only when two vector * * * lines have a common * * * point can we get the three-point * * * line.

6. Two vectors are equal if and only if their coordinates are the same. At this time, we should pay attention to the idea of equation.

There are often two kinds of plane vectors: one is to examine addition and subtraction, parallelogram rule and triangle rule, and plane vector straight line theorem; The second is to examine the quantity product. At this time, pay attention to the application of the basic theorem of plane vector, choose the appropriate basis and simplify the operation process.

Ps: I hope I can help you.