1, judging the image of the function according to its properties;

2. Judge the image of the function according to the actual problem;

3. Judge the image of the function by combining the moving point problem in the geometric figure;

4. Analyze whether the function image is right or wrong.

There is also an extended question type, which is the image judgment geometry of the analysis function. The form of the question is novel, but it is not difficult. Students can practice!