As shown in the figure, the line AB = 10cm, the point C is any point on AB, the point m is the midpoint of AC, and the point n is the midpoint of CB

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• 1. As shown in Figure 5, point C is the point on line AB, point m is the midpoint of line AC, and point n is the midpoint of line BC. (2) AC: CB = 3:2, Mn = 10cm, Find the length of am A----M----C--N--B
• 2. As shown in the figure, point C is on line AB, and points m and N are the midpoint of AC and BC respectively. (1) if AC = 8cm and CB = 6cm, find the length of line Mn; (2) if C is a line As shown in the figure, point C is on line AB, and points m and N are the midpoint of AC and BC respectively (1) If AC = 8cm, CB = 6cm, find the length of line Mn; (2) Can you guess the length of Mn if C is any point of AB, AC + CB = A and other conditions remain unchanged;
• 3. As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the straight line AB at the speed of 1cm / s and 2cm / S (C is on the line AP and D is on the line BP) (2) under the condition of (1), q is the point on the straight line AB, and aq-bq = PQ, calculate the value of pqab. (3) under the condition of (1), if there is CD = 12ab after 5 seconds of C and D movement, then point C stops moving and point D stops moving Continue to move (point D is on line Pb), m and N are the midpoint of CD and PD respectively. The following conclusions can be drawn: (1) the value of pm-pn remains unchanged; (2) the value of mnab remains unchanged, which means that only one conclusion is correct. Please find out the correct conclusion and evaluate it (1) If there is always PD = 2Ac when C and d move to any time, please indicate the position of P on line ab
• 4. As shown in the figure, point P is the point on the fixed length line AB, and points c and D respectively start from P and B and move to the left along the straight line AB at the speed of 1cm / s and 2cm / s As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the line AB at the speed of 1cm / s and 2cm / S (C is on the line AP and D is on the line BP) (1) If C and d move to any moment, there is always PD = 2Ac and ab = 6 Quick, quick,
• 5. As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the straight line AB at the speed of 1cm / s and 2cm / S (C is on the line AP) As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the line AB at the speed of 1cm / s and 2cm / S (C is on the line AP and D is on the line BP) (3) Under the condition of (1), if CD = 1 / 2Ab happens to exist after C and d move for 5 seconds, then point C stops moving and point d continues to move (point D is on line Pb), and m and N are the midpoint of CD and PD respectively. This paper attempts to explore the quantitative relationship between line Mn and AB, and gives a conclusion and reasons
• 6. As shown in the figure, P is the point on the fixed length line AB, and C and d start from P and B respectively along the straight line AB at the speed of 1cm / s and 2cm / s
• 7. As shown in the figure, P is the point on the fixed length line AB, C and d start from P and B respectively and move to the left along the straight line AB at the speed of 1cm / s and 2cm / s, C is on the line AP, (C is on the line AP, D is on the line BP) when C and d move to any time, there is always PD = 2Ac, then AP / AB equals () a.1/2 b.1/3 c.1/4 d.1/5. (2) under the condition of (1), q is a point on the line AB, and aq-bq = PQ, find the value of PQ / ab
• 8. As shown in the figure, P is the point on the fixed length line AB, and C and D respectively start from P and B and move to the left along the line AB at the speed of 1cm and 2cm per second. C is on the line AP D is on line BP (1) What is the quantitative relationship between the length of BD and PC? Explain the reason (2) If C and d move to any time, there will always be PD = 2Ac, please explain the position of point P on line AB! Figure: a -------- C --- P -------- D -------- B 20: 30, plus points!
• 9. It is known that: as shown in Figure 1, M is a certain point on the fixed length line AB, C and D respectively start from m and B and move to the left along the straight line BA at the speed of 1cm / s and 3cm / s, and the direction of motion is shown by the arrow (C is on the line am, D is on the line BM) (1) If AB = 10cm, when points c and d move for 2S, find the value of AC + MD. (2) if points c and d move, there is always MD = 3aC, fill in the blank directly: am=______ Ab. (3) under the condition of (2), where n is a point on the line AB and an-bn = Mn, the value of mnab is obtained
• 10. Points a and B are on the straight line Mn, ab = 11 cm, circle a moves from left to right at the speed of 2 cm per second, and at the same time, the radius of circle B increases, its radius is r cm, and the relationship between the radius and time t is r = 1 + T (T > 0) Wen: how many seconds after point a starts, the two elements are tangent The radius of circle a and B is 1 cm
• 11. If M is the midpoint of AC, n is the midpoint of BC, and ab = 10cm, the length of Mn is obtained
• 12. Given that four points a, B, C and D are on the straight line L, ab = 10cm, CD = 4cm, and points m and N are the midpoint of AC and BD respectively, the length of segment Mn is calculated I'm in a hurry, By 20 o'clock today A total of 10 cases Please list them one by one DC = CD, so there are many cases I know the answer, To write a little paper, ..... And please use easy to understand language to answer,,,,,,
• 13. As shown in the figure, line AB = 8cm, C is the point on line AB, AC = 3.2cm, M is the midpoint of AB, n is the midpoint of AC. (1) find the length of line cm; (2) find the length of line Mn
• 14. As shown in the figure, line BD = 1 / 3AB = 1 / 4CD, points m and N are the midpoint of line AB and CD respectively, and Mn = 20cm |------|--|----|----|---------| A M D B N C
• 15. As shown in the figure, ab = CD, CB = 1 / 3AB, points m and N are the midpoint of AB and CD respectively, and Mn = 8cm Anyway, there are two answers. What should I do In silence
• 16. As shown in the figure, line BD equals one third AB equals one fourth CD, points m and N are the midpoint of line AB and CD respectively, and Mn equals 20 cm, so find the length of AC
• 17. As shown in the figure, take a point D on AB, take a point C on the extension line of AB, so that BD = 1 / 3AB = 1 / 4bc, and the midpoint of line AB and BC are m, n respectively, Mn = 7cm, Finding the length of line AB, CD
• 18. Given the line segment AB, extend AB to C so that BC = 1 / 2Ab, D is the midpoint of AB, DC = 10cm, and calculate the length of ab
• 19. The segment AB of point C is 5:3, and the segment AB of point D is 3:5. Given DC = 10cm, find the length of ab
• 20. As shown in the figure, given point C, segment AB is 5:3, and point D is the midpoint of AC. if DC = 10cm, calculate the length of ab