The Solution of Vector Exercises in Senior High School Mathematics
1. vector CB=a vector PA+ vector PB, CB-PB=aPA, CP=aPA, and P is on CA;
2. Vector OA+2 vector OB+3 vector OC = 0 OA+OC =-2 (OB+OC), 2 OD =-4 OE, OD =-2 OE, D is the midpoint of AC, E is the midpoint of BC, O score DE is 2: 1, SOAC = 2/3 SEAC = 65438+.
The area ratio of triangle ABC to triangle AOC is 3.