Is the sum of two rational numbers greater than the sum of two addends

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• 1. 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
• 2. 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
• 3. 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
• 4. The sum of two rational numbers must be greater than each addend Answer the above question urgently
• 5. A is a rational number. Must 10A be greater than a? Must a third of a be less than a? Be specific
• 6. A is a rational number. Must 10A be greater than a? Must a / 3 (a third) be less than a?
• 7. 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
• 8. 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
• 9. 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
• 10. 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)
• 11. 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,
• 12. 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
• 13. 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?
• 14. 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!
• 15. As shown in the figure, AEB = NFP, M = C, judge the size relationship between a and P, and explain the reason
• 16. 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
• 17. It is known that, as shown in the figure, the straight lines a and B are cut by the straight line C, and ∠ 1 + ∠ 2 = 180 degrees. To prove that a is parallel to B, do you know how many methods to prove that a is parallel to B? To solve these problems, we must use the knowledge of grade two (including grade two)
• 18. The line a is parallel to B, B is parallel to C, D intersects with a at point m (2). Judge the position relationship between C and D, and explain the reason
• 19. Given a (- 1,1), B (1,3), C (2,5), try to judge the position relationship of a, B, C
• 20. Given three points a (1,3), B (- 2,0), C (12,4), try to judge whether these three points are on the same straight line, and explain the reason