If AB equals a, then Mn equals? If O and P are the midpoint of AM and BN respectively, then OP and so on

First question: Mn = 1 / 2A
The second question is op = 3 / 4A

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1. If there are two points m and N on the line AB, point m divides AB into two parts of 1:2, point n divides AB into two parts of 2:1, and Mn = 4cm, then am=______ cm，BN=______ cm．
2. As shown in the figure, C is the point on the line AB, M is the midpoint of AC, n is the midpoint of BC, e is the midpoint of AB, Mn = 5, CE = 1 The length of AB and en
3. As shown in the figure, given point C is the midpoint of line ab. D is any point on line AC. m and N are the midpoint of ad DB respectively. If AC = 16, find the length of Mn We must complete the whole process
4. As shown in the figure, given that point C is the midpoint of line AB, D is any point on AC, m and N are the midpoint of AD and DB respectively, if AB = 16, find the length of Mn
5. It is known that the line segment AB = CD, which coincides with one third of each other, m and N are the midpoint of AB and CD respectively, and Mn = 14cm, the length of AD
6. As shown in the figure, points a, B and C are successively on line L, point m is the midpoint of line AC, and point n is the midpoint of line BC. If AB = 12, the length of Mn is () A. 6B. 4C. 5D. 2
7. C is any point on the line AB, M is the midpoint of AC, and N is the midpoint of ab. if BC = 10cm, then the length of the line Mn is A M C N B _________________________ infer
8. As shown in the figure, C is any point on AB, M is the midpoint of AC, and N is the midpoint of BC. If AB = 10cm, calculate the Mn degree of the line segment
9. As shown in the figure, ab = 12cm, point C is on the line AB, and AC = 10cm, m and N are the midpoint of AC and BC respectively
10. Given the line AB = 10cm, C is any point on the line AB, M is the midpoint of AC, n is the midpoint of BC, find the length of Mn! There are three points a, B and C on the straight line L. we know that BC = 2Ab, D is the midpoint of AC, and BD = 12cm?
11. As shown in the figure, M is the midpoint of line AB, point C is on line AB, and AC = 4cm, n is the midpoint of AC, Mn = 3cm, then line ab=______ cm．
12. As shown in the figure, M is the midpoint of line AB, point C is on line AB, and AC = 4cm, n is the midpoint of AC, Mn = 3cm, then line ab=______ cm．
13. As shown in the figure, M is the midpoint of line AB, point C is on line AB, and AC = 6cm, n is the midpoint of AC, Mn = 4cm, find the length of line cm and ab A________ N________ C____ M_____________ B
14. Given that CD = 4 / 1ab, AC = BD, m and N are the midpoint of AC and DB respectively, and Mn = 10cm, find the length of ab
15. Given that AC: CD: DB = 4:5:6, M is the midpoint of AC, n is the midpoint of BD, Mn = 6cm, find the length of ab
16. As shown in the figure, C is the midpoint of line AB, D is any point on AC. m and N are the midpoint of AD and DB respectively, and AC = 7cm is used to find Mn
17. As shown in the figure, given that point C is the midpoint of line AB, D is any point on AC, m and N are the midpoint of AD and DB respectively, if AB = 16, find the length of Mn
18. As shown in the figure, C and D are two points on the line ab. given that AC: CD: DB = 1:2:3, m and N are the midpoint of AC and DB respectively, and ab = 18cm, the length of the line Mn is calculated
19. A. B is the two points on the line EF. It is known that EA: ab: BF = 1:2:3, m and N are the midpoint of EA and BF respectively, and Mn = 8cm
20. M and N are the two points on the line EF. It is known that EA: ab: BF = 1:2:3, m and N are the midpoint of EA and BF respectively, and Mn = 8cm Write out the problem-solving process of geometry