The sum of two rational numbers must be greater than each addend Answer the above question urgently

Not necessarily. For example, 5 + (- 8) = - 3
The sum is - 3, less than the addend 5

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1. A is a rational number. Must 10A be greater than a? Must a third of a be less than a? Be specific
2. A is a rational number. Must 10A be greater than a? Must a / 3 (a third) be less than a?
3. The new definition calculation (a △ B = 10A power X 10B power) is listed as 3 △ 4 = 10 ^ 3 * 10 ^ 4 = 10 ^ 7 (1) Find the value of 3 △ 7 (2) Is (m △ n) △ P equal to m △ n △ p? Please explain why
4. The value to the 13th power is? If the new operation m * n = mn-m-n + 1 is defined, then when a * b = 0, the value of power 2012 of (A-1) and power 2013 of (B-1) is
5. New definition calculation (a △ B = 10A power X 10B power) verification: (m △ n) △ P is equal to m △ (n △ P) Define an operation: a △ B = 10A power, x10b power, for example: 3 △ 4 = 10 & # 179; X10 power From the meaning of the title, we can get: to verify whether (m △ n) △ P is equal to m △ n △ P
6. If we define the power a of a ⁃ B = 10, the power B of * 10, and the power B of a ⁃ B = (the power a of 10), we calculate the values of the following formulas （1）、（4※3）×（2☆5）；（2）、（3※5）×（6☆3） Given the square of (a + 1) + | B-2 | + (1 / 2 + C) = 0, find the value of the cube of (- 2 / 3a, the square of C) and (4 / 3a, the square of C) × (- A, the square of B)
7. If we define a new operation "*" and a * b = B power of a - a power of B, then 4 * (3 * 2)?
8. It is stipulated that * is an operation symbol, a * b = B power of a - a power of B, try to calculate 3 * 2
9. It is stipulated that * is a kind of operation symbol, a * b = B power of a, and 3 * 2 = ()
10. A = (0.0 ····· 025) 2000 zeros, B = 0. (0 ····· 0) 16 2001 zeros, try to find a + B, a-b.a · B.A divided by B
11. If two rational numbers are added, is the sum greater than each addend? If two rational numbers are subtracted, is the difference less than the subtracted? Please explain the reason
12. If two rational numbers are added, is the sum greater than each addend? If two rational numbers are subtracted, is the difference less than the subtracted? Please explain the reason
13. If two rational numbers are added, is the sum greater than each addend? If two rational numbers are subtracted, is the difference necessarily less than the subtracted? Please explain the reason
14. Is the sum of two rational numbers greater than the sum of two addends
15. Use 100 cm fence to form a round field. Please judge whether the area of the field is rational? Please explain the reason Well, I'm a student,
16. If two non-zero rational numbers a and B satisfy the relation a + B = 0, can you judge whether their product a * B is positive or negative? If so, please explain the reason
17. Judgment: for any rational number, there are (a + b) &# 178; ≠ A & # 178; + B & # 178; But what if a and B are equal to 0 and 1 respectively?
18. If n is known to be a rational number, does the value of quadratic trinomial n & # 178; - 4N + 5 have a maximum or a minimum? Please explain why Detailed answer steps. I am a student, 20 points reward!
19. As shown in the figure, AEB = NFP, M = C, judge the size relationship between a and P, and explain the reason
20. As shown in the figure, a, B and C are on the same straight line, and ∠ 1 = 2, ∠ 3 = D. try to judge the position relationship between BD and CE, and explain the reason