On the number axis, if the rational number represented by point a is - 2, then the rational number represented by four points of unit length to point a is - 2

On the number axis, if the rational number represented by point a is - 2, then the rational number represented by four points of unit length to point a is - 2


|x-(-2)|=4
x+2=±4
X = 2 or x = - 6



If a and B represent rational numbers, try to judge the size of | A-B | and | B-A | and tell the meaning of | A-B | according to the number axis


|a-b|=|b-a|
|The meaning of A-B | is the distance between the point representing a and the point representing B on the number axis



On the unit length of rational number axis
A number axis, from 0 to right, is marked with 100200300... Is 100 a unit length?


Yes, the unit length is determined by the convenience of solving the problem