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Given two points a and B on the number axis, the distance between points a and B is 1, and the distance between point a and origin 0 is 3, then the number corresponding to point B is______ ．
The distance between ∵ point a and origin 0 is 3, the number represented by ∵ point a is ± 3, the distance between ∵ points a and B is 1, the number represented by ∵ point B is 3 + 1 = 4, 3-1 = 2, or - 3 + 1 = - 2, - 3-1 = - 4, so the number corresponding to point B is ± 4, ± 2
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