The length of AM is () A. 4.5cmB. 6.5cmC. 7.5cmD. 8cm

As shown in the figure, ∵ point C is on AB, and AC = 13bc, ∵ AC = 14ab = 3cm, ∵ BC = 9cm, and M is the midpoint of BC, ∵ cm = 12bc = 4.5cm, ∵ AC + cm = 7.5cm, so select C

RELATED INFORMATIONS

1. Let a and B be square matrices of order n and E be identity matrices of order n. It is proved that if a + B = AB, then A-E is invertible
2. For a tree, the degree of node is k at most (k > = 2), and it is proved that there are at least k leaves
3. What is the difference between 316L and 316 stainless steel
4. On the operation of exponent and exponential power 1. Evaluation or simplification: Root (5 + (2 root 6)) + root (7 - (4 root 3)) - root (6 - (4 root 2)) 2. Given x = (1 / 2) (radical a / B + radical B / a) (a > 0, b > 0), find the value of the following formula: (2B times root ((x ^ 2) - 1)) / (x-root ((x ^ 2) - 1)
5. If a + 2B + 3C + 4 = 0, find 3 ^ A / 9 ^ - B × 27 ^ C
6. If a: B: C = 2:3:4 and a + B + C = 27, then a-2b-3c=______ ．
7. Given a / 2 = B / 3 = C / 4, find (a + 2B + 3C) / (a-2b-3c)
8. It is known that a: B: C = 2:3:4, a + B + C = 27, then the value of a-2b-2c is______ ．
9. Given a: B: C = 2:3:4, a + B + C = 27, find the value of a-2b-2c This is how I solve this problem, because the sum of three numbers is 27 and the total score is 9, so finding a is 27 times 2 / 9 Let a / 2 = B / 3 = C / 4 = K. how did this change?
10. It is known that a: B: C = 2:3:4, a + B + C = 27, then the value of a-2b-2c is______ ．
11. The third, fifth and seventh product of the increasing equal proportion sequence is 512. The three terms are subtracted by 1, 3 and 9 to form the equal difference sequence. Let Sn = A1 ^ 2 + A2 ^ 2 + +An ^ 2, find SN
12. Solving the equation 4x ^ 2 + 8x + 4 = 9 (x-1)
13. Solve the equation. (check the calculation with △ sign) 3x + 5x-4x = 1.6x-0.36x = 323.6x + 4.5X = 56.79x-0.4x = 25.8 △ 17.8x-12.4x = 1.08 △ 26.4x + 18x = 66.6
14. Xiaogang is 1.5 times as old as Xiaoqiang, Xiaofang is 1.2 times as old as Xiaoqiang, Xiaogang is 3 years older than Xiaofang Equation answer
15. It is known that 5A + 4 and 3a-4 are the square roots of the same number. Try to find the value of A A is 0 absolutely true, but is a - 4 true?
16. How to distinguish 201202304316 and other stainless steels
17. 2、 In the class committee election of a class, it is known that Kan Zhiqiang, Shang Lili and Wang Honghong are candidates for the class committee (1) If Kan Zhiqiang is elected, Wang Honghong will also be elected; (2) If Shang Lili is elected, Wang Honghong will not be elected; (3) If Wang Honghong is not elected, Kan Zhiqiang or Shang Lili can be elected Try to use the main disjunctive paradigm to find all the possibilities of three elected class committee be deeply grateful!
18. It is known that the eigenvalues of a 3-order square matrix are 2, - 1,0. Find the eigenvalues and B of the matrix B = 2A ^ 3-5a ^ 2 + 3E (knowledge of eigenvalues and eigenvectors of matrices)
19. Given the line AB = 60cm, draw the line BC on the line AB so that BC = 20cm, point D is the midpoint of AC, and find the length of CD
20. It is known that the product of the first three terms of the increasing equal ratio sequence {an} is 512, and the three terms are subtracted by 1, 3 and 9 to form the equal difference sequence. The general term formula of the sequence {an} is obtained