If the lengths of the three sides of the triangle are 4, 1-2a and 7, then the value range of a is 0

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• 1. If the lengths of the three sides of the triangle are 4,1-2a and 9, then the value range of a is 0
• 2. Given that the lengths of the three sides of the triangle ABC are a + 1, 2a-1 and a + 4, then the value range of a is
• 3. The three sides of the triangle are 4, 6 and 2m-1 respectively. The value range of M can be obtained. If M is even, the value of M can be obtained
• 4. If the three sides of the triangle are 3, 1-2a and 8, then the value range of a is () A. - 6 ＜ a ＜ - 3B. - 5 ＜ a ＜ - 2C. 2 ＜ a ＜ 5D. A ＜ - 5 or a ＞ - 2
• 5. Let 2A + 1, a, 2a-1 be the three sides of an obtuse triangle, then the value range of a is? Give me an exact answer It's a high school problem It's not just three sides
• 6. Given the lengths of ABC edges of triangle 2a, 5, 3A + 5, find the value range of A
• 7. We know four different rational numbers a, B, C and D, and ab is less than 0, A-B is greater than 0, a + B is less than 0, B + C = O, where the absolute value of a is 0
• 8. It is known that ABCD is four different rational numbers, AB < 0, A-B > 0, a + B < 0, and B + C = 0, CD = - 1, where (continue) | a | > 1, try to determine the size relationship of ABCD, and show it on the number axis. (number axis or something, write out the numbers, and use - to type out the interval of each number) that.. you should pay a little attention to the format, it's better to segment, otherwise you will have a headache. Thank you (bow)
• 9. If a is less than 0 and the absolute value of a is greater than that of B, then A-B is equal to?
• 10. When the absolute value of a + B is equal to the absolute value of a - the absolute value of B, what rational numbers should a and B be
• 11. When x is a rational number, find the value range of X in | x | + 2010 = | x-2010 |
• 12. For the rational number x, if the square of X is greater than itself, then the value range of X is____ If the square of X is less than itself, then the value range of X is______ How can the second space not find such a number? If it is 0, then the square is itself, and so is 1
• 13. |X-2 | - | x + 1 | > A is constant on X ∈ R, and the value range of a is obtained
• 14. If a * x * x + A * x + 1 ＞ 0, the value range of a is obtained
• 15. Given f (x) = (1ax − 1 + 12) · X3 (a > 0 and a ≠ 1); (1) find the domain of definition of function f (x); (2) discuss the parity of F (x); (3) if f (x) > 0 is constant in the domain, find the range of value of A
• 16. The rational number B satisfies | 2|
• 17. Given 2A + B = 0, if B is greater than or equal to - 2, find the value range of A
• 18. If 3 ≤ a
• 19. If a is greater than or equal to 6, less than or equal to 10, B is greater than or equal to a / 2, less than or equal to 2a, C = a + B, calculate the value range of C Help!
• 20. Given a = (- 2,2), B = (2,2), find the absolute value of 2A + B, a-2b, b-2a