A digraph has n nodes, and the adjacency matrix is used to represent the binary relationship. The adjacency matrix is generated randomly by C + +, and the code is obtained?

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1. It is known that 724 - 1 can be divided by two integers between 40 and 50
2. (4a+3x)(4a-3x)=
3. How many centimeters is 200 meters
4. 1/10×11+1/11×12+…… 1/19×21+1/20
5. This year, three times of Xiaogang's age is equal to five times of Xiaofang's age. Ten years later, if four times of Xiaogang's age is equal to five times of Xiaofang's age, Xiaogang's age this year will be five times______ I'm 40 years old
6. Solution equation: 0.6x + 9 / 5 = 7x
7. 4.2-0.8x=3.4x,
8. It is known that a B is opposite to each other, C D is reciprocal to each other, and the absolute value of X is 5 to find the value of X + 5A + 5B CD
9. a. The following conclusions are not necessarily correct: A, 5A + 5B + 0b, a / b = - 1, C, AB greater than or equal to 0 D. The absolute value of a is equal to the absolute value of B
10. Decomposition factor (2a-b) (3a-2b) - 5A (2a + b) Such as the title
11. Let a square matrix of order n satisfy a ^ 3 = 0, then the invertible matrix in the following matrices B = A-E, C = a + e, d = a ^ 2-A, f = a ^ 2 + A is, and it is proved that Such as the title
12. Given that the line segment AB = 20cm, there is a point C on the line AB, and BC = 6cm, M is the midpoint of the line segment AC, find the length of the line segment BM
13. 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 respectively to form the equal difference sequence, so as to prove 1 / A1 + 2 / A2 + ﹢n/an﹤1
14. 4.8x - (4x-3) = 48 36 × (2x-3.6) = 72 solutions
15. (3b)^2= 2.—（ab）^2 3.（-4a^2）^3 4.（y^2z^3)^3 5.(xy^3n)^2+(xy^6)^n 6.(-3x^3)^2-[（2x）^2]^3
16. Decompose the following formulas: (1) the square of 3x + 6x + 3 (2) the square of ax - 4ax + 4a (3) the square of XY - 2x the square of Y + the third power of X y (4) The second power of (x + y) + 6 (x + y) + 9 (5) 16-24 (X-Y) + 9 (X-Y) the second power of (6) the fourth power of x the fourth power of y the second power of 8x the second power of Y + 16
17. a+b+c=0 a-b+c=6 4a+2b+c=3 To solve the linear equation of three variables a + B + C = 0, 4A + 2B + C = 3, A-B + C = 6
18. a-b+c=3 a+b+c=3 4a+2b+c=6 a=?b=?c=?
19. A-B + C = 0, a + B + C = 0, 4A + 2B + C = - 3, get a, B, C
20. Verification: if a ^ 3 + AB ^ 2 + 4A + B ^ 3 + A ^ 2B + 2b-3a ^ 2-B ^ 2-2ab-2 is not equal to 0, then a + B is not equal to 1