What is the meaning of 316 stainless steel belt?

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• 1. The square roots of a positive number are 3x-5 and 8-6x. Find the value of X
• 2. 8:7 plus 2x equals 13:5 (simple equation) simple and slightly complex equation! Quick, I just need an answer
• 3. 18x-66=7x Is an equation. Find the formula
• 4. How to solve the equation 6.8x + 2.4x = 9.66 The equal sign should be aligned!
• 5. 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
• 6. 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
• 7. 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)
• 8. 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!
• 9. How to distinguish 201202304316 and other stainless steels
• 10. 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?
• 11. Let G be a simple connected graph with n nodes and N edges, and there are nodes with degree 3 in G. it is proved that there is at least one node with degree 1 in G
• 12. Example: R is a reflexive relation on the set X. it is proved that R is symmetric and transitive if and only if There is a difference between a, b > and in R Example: let R 1 and R 2 be two equivalence relations in set a, and R 1, R 2 = R 2, R 1, R 2 is also the equivalence relation on a Proof: 1) reflexivity (omitted) 2) Symmetry (omitted) 3) Transitivity: If, then And, so, so And then by and by transmission, we get, Again by knowing, so, so, again by and is transmitted, get, and so Example: let R be a reflexive transitive binary relation on set a, and let t also be a binary relation on set a, and satisfy the following conditions: . prove: t is the equivalent relation on a
• 13. After the elementary transformation of matrix, is the original matrix equal to the transformed matrix? Why are they equal? Take R1 * 999 1 0 0 0 0 5 2 8 0 2 3 4 So a11 is 999,
• 14. Matrix transformation What matrix is used to change y = x2-1 into y = | x2-1 | is it necessary to segment
• 15. What is the row exchange of a matrix?
• 16. Why is the matrix representing the transformation always placed on the left side of the transformed matrix in matrix multiplication
• 17. Matrix graphic transformation Let me ask a more professional question: when using matrix multiplication method to carry out graphic transformation, the order of each transformation matrix cannot be adjusted. However, how can I know which matrix is in the front and which matrix is in the back?
• 18. Discrete mathematics problem, let R be a binary relation on a, define s = {(a, b) | &; C ∈ a, (a, c) ∈ R, (C, b) ∈ r}, prove Let R be a binary relation on a, define s = {(a, b) | &; C ∈ a, (a, c) ∈ R, (C, b) ∈ r}, prove that if R is an equivalence relation on a, then s is also an equivalence relation, and S = R It's OK to connect~
• 19. How is the binary relation calculated? R1={(a,b),(c,d)},R2={(b,c),(d,e)} So R1 * R2 = {(a, c)}, R2 * R1 = {(B, d)} What do I think, R1 * R2 = {(a, c), (C, e)}, Because (a, b) (B, c) can get (a, c) (C, d) (D, e) can get (C, e)
• 20. In discrete mathematics, the definition of binary relation on set (a, B, c) and why it is transitive relation is related to their relation It doesn't match, it doesn't match the symmetry