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The topic of rectangular coordinate system in high school mathematics space
Draw a picture (not here), some vectors have not been proved to be equal.

Let D(x, y, z), vector ab = (0,4,0), DC = (4-x, 3-y,-1-z), and ab = DC to get d (4,4 1, 1).

Then D 1(4,-1, 3) can be obtained from AA 1=DD 1.

C1(4,3,3) can be obtained from AB=D 1C 1.