AB is two points on the number axis, and the corresponding rational number of AB on the number axis is -3,5 when When point P moves on the line segment OB, M is the midpoint of PA, N is the midpoint of OB, and the quantitative relationship between line segment MN, OP and AB is obtained. AB is two points on the number axis, and the corresponding rational number of AB on the number axis is -3,5 when When point P moves on line segment OB, M is the midpoint of PA, N is the midpoint of OB, and the quantitative relationship between line segment MN, OP and AB is obtained.

AB is two points on the number axis, and the corresponding rational number of AB on the number axis is -3,5 when When point P moves on the line segment OB, M is the midpoint of PA, N is the midpoint of OB, and the quantitative relationship between line segment MN, OP and AB is obtained. AB is two points on the number axis, and the corresponding rational number of AB on the number axis is -3,5 when When point P moves on line segment OB, M is the midpoint of PA, N is the midpoint of OB, and the quantitative relationship between line segment MN, OP and AB is obtained.

A:
Point P moves on OB, let point P be x,0OP=x, PB=OB-OP=5-x
Point M is the midpoint of PA, then point M is:(x-3)/2
N is the midpoint of OB, and the point N is:(0+5)/2=5/2
Therefore: MN=5/2-(x-3)/2=(5-x+3)/2=(8-x)/2
AB=5-(-3)=8
Therefore:
MN=(AB-OP)/2

The position of the rational number on the number axis is as follows: a at point +1, b at point +2, c at point -3, and the algebraic formula:|a|-|a+b||c-a||b-c| The position of the rational number on the number axis is as follows: a at point +1, b at point +2, c at point -3, simplifying the algebraic formula:|a|-|a+b||c-a||b-c|

Original formula=1-|3-4 5|=1-3+4+5=7

Original=1-|3-4 5|=1-3+4+5=7