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
Let EA be x, then AB = 2x, BF = 3x, EA / 2 + AB + BF / 2 = 8, X / 2 + 2x + 3x / 2 = 8, x = 2, EF = x + 2x + 3x = 6x = 12
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- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. 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.
- 9. 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.
- 10. If AB equals a, then Mn equals? If O and P are the midpoint of AM and BN respectively, then OP and so on
- 11. It is known that there are two points c and D on the line AB, and AC: CD: DB = 2:3:4 EF = 2.4cm, e and F are the midpoint of AC and DB respectively, and the length of AB is calculated
- 12. As shown in the figure, two points B and C divide the line ad into three parts: 2:3:4. E is the midpoint of the line ad, CD = 12cm, and find the length of CE
- 13. As shown in the figure, the quadrilateral ABCD is a parallelogram, DB ⊥ ad, ad = 8cm, BD = 12cm, find the length of BC and AC Please think for yourself, I can't upload the picture
- 14. As shown in the figure, the common part of AB and CD is BD, and BD: ab: CD = 1:3:5, EF is the midpoint of AD and CB respectively, EF = 12cm, find the length of AB and CD
- 15. As shown in the figure, D is the midpoint of CB, AC: CB = 1:6, DB = 12cm, find the length of AD |_____ |______ |______ | A C D B
- 16. As shown in the figure, D is the midpoint of CB, AC is 1:6 than CB, and DB is 12cm
- 17. P is a certain point on the fixed length line ab. it is known that ab = 30cm. C and d start from P and B and move to the left along the line AB at the speed of 1cm / s and 2cm / s respectively (C is on the line AP and D is on the line BP). 1. In the process of movement, there is always PD = 2Ac. Please explain the position of P on the line ab
- 18. When the diameter of ⊙ o is 10cm, the chord AB / / CD, and ab = 8cm, CD = cm, the distance between the chord AB and CD is
- 19. As shown in the figure, point AB is on the straight line Mn, ab = 13, circle a, radius of circle B is 1, circle a moves from left to right along the straight line Mn at the speed of 3 per second, in the process of circle a's movement, its radius is 1 At the same time, circle B moves along the straight line Mn from right to left at the speed of 1 per second, and its radius remains the same. (1) try to write the functional relationship between the distance d between points AB and time T. (2) how long does circle a and circle B move and how many times are two circles tangent
- 20. As shown in the figure: points a and B are on the straight line Mn, ab = 11 cm, circle a, and the radius of circle B is 1 cm. Circle a moves from left to right at the speed of 2 cm per second. At the same time, the radius of circle B is also increasing. The relationship between radius R (CM) and time t (s) is r = 1 + T (t ≥ 0