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How about the shortest distance of moving point in junior middle school mathematics?
First of all, I will take the senior high school entrance examination the day after tomorrow.

The three points you said are very simple. Find a fixed value. If there is the shortest distance in the senior high school entrance examination, one of them is the fixed value. Find a fixed value.

The remaining two points will be given to an edge, so you can make a symmetrical point of a point, then connect the symmetrical point with that point, then find out how to connect it, and then find out, don't be nervous, believe in yourself.