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Like junior high school math?
Piecewise function should be high school content! The topic is difficult and needs to be discussed.

In the original sketchpad file, the animation of piecewise function point D is my unique skill. I remember doing it once a few years ago, and the point moves around a triangle, similar to the movement of point D on the dotted line DAB. If you want the original gsp file, you can send an email address in the comments.