First, through review, students can master the basic knowledge of mathematics accurately and skillfully and use it flexibly.
Second, through review, systematize the learned knowledge, and let it cross in students' minds to form a knowledge network.
Third, combining with the actual situation of students, through review, make up the gap and make up for the shortcomings. At the same time, it makes up for the shortage of teachers in teaching.
Fourth, through review, students can further improve their thinking ability and their ability to analyze and solve problems while systematically mastering knowledge.
Coordinates of point C: x=(0+6)/2=3, y=(0+0)/2=0. So c (3 3,0).
The coordinate of the symmetrical point C' of point C about the Y axis is (-3,0).<