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

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• 1. 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
• 2. Given the lengths of ABC edges of triangle 2a, 5, 3A + 5, find the value range of A
• 3. 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
• 4. 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)
• 5. If a is less than 0 and the absolute value of a is greater than that of B, then A-B is equal to?
• 6. 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
• 7. The rational numbers a, B, C are not 0, and a + B + C = 0, let x = B + C the absolute value of a + C + a the absolute value of B + A + B the absolute value of C Find the value of the 19th power - 99x + 2004 of the algebraic formula x
• 8. What is the sum of all rational numbers whose absolute value is not greater than 3.14
• 9. It is known that AB is a rational number and its position on the number axis is shown in the figure ______________________ → b 0 a Simplification: B-A + A-B + A + B
• 10. AB is two points on the number axis, and the rational numbers corresponding to AB on the number axis are - 3 and - 5 respectively When point P moves on line ob, M is the midpoint of PA and N is the midpoint of ob. Find out the quantitative relationship among line Mn, OP and ab
• 11. 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
• 12. 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
• 13. If the lengths of the three sides of the triangle are 4,1-2a and 9, then the value range of a is 0
• 14. If the lengths of the three sides of the triangle are 4, 1-2a and 7, then the value range of a is 0
• 15. When x is a rational number, find the value range of X in | x | + 2010 = | x-2010 |
• 16. 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
• 17. |X-2 | - | x + 1 | > A is constant on X ∈ R, and the value range of a is obtained
• 18. If a * x * x + A * x + 1 ＞ 0, the value range of a is obtained
• 19. 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
• 20. The rational number B satisfies | 2|