If x < 2, simplify X-2. Note that this simplified X-2 is an absolute value. Parentheses represent absolute values.

X-2=2-X

Topic 2

Given that A minus 4+B minus 8=0, find the value of A=B divided by AB.

A=4，B=8

(A-B)÷AB=(-4)÷32=- 1/8

Theme 3

Li Ming drew a number axis when he was doing the problem. There is a point a on the number axis, which represents the number -3. Due to carelessness, he marked the original position of the number axis in the wrong place, so that point A fell in the position of 2. Think about it: how to move the far point to draw the number axis correctly?

2-(-3)=5, shifted to the left by 5 units. To restore, the origin needs to be moved 5 units to the right.