There are two points A(x1, y1) B(x2, y2) whose coordinates of the midpoint P are ((x1+x2)/2, (y1+y2)/2)

In addition: any point (x, y) with respect to (a, b) is (2a-x, 2b-y) and (2a-x, 2b-y) is also on this function.

There is f(2a-x)= 2b-y shift term, there is y=2b- f(2a-x)

X1：8； Y1：9

X2：2； Y2：3

Click "calculation" to output the result

Midpoint: 5,6

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