If real numbers a and B satisfy 1 / 2A AB + B & sup2; + 2 = 0, then the value range of a is I know to use formula method to calculate, but I don't know why I calculate a greater than or equal to - 2 and a greater than or equal to 4, which is different from the answer. The answer is a > = 4 or a

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• 1. If real numbers a and B satisfy 12a − AB + B2 + 2 = 0, then the value range of a is______ ．
• 2. Given that a and B are both negative real numbers, the minimum value of AA + 2B + Ba + B is () A. 56B. 2（2-1）C. 22-1D. 2（2+1）
• 3. B + 3A AB = 0, find the minimum of a + 2B a>0,b>0
• 4. 3A + 2B = 1, a > 0, b > 0, find the minimum value of ab
• 5. Factorization a (a + b) - (3ab-b ^ 2)
• 6. Who can help me explain how factorization can change symbols? For example, the following question -ab(a-b)^2+a(b-a)^2-ac(a-b)^2 The answer I wrote in my textbook was (a-b) (AB + a-ac) But the answer I'm getting older now is (a-b)^2(ab+a+ac) Note: be sure to tell me how to convert the symbol - 0-~ For example, how to change the symbols in this question? A (A-2) + B (A-2) + C (2-A) how should I use (A-2) as the common factor?
• 7. The more, the better. Please note the meaning of the symbol Come on, online, etc Thanks, but please give me an answer
• 8. What is the value of the algebraic expression x minus 3Y if x plus 2, y equals minus 7, 2x minus y equals 2
• 9. How to solve that 2x plus 5Y equals negative 3, 2x minus 3Y equals 5
• 10. 3 (the power of 2x minus the power of Y) - 2 (the power of 3Y minus the power of 2x) is equal to? (the second power of a + the second power of 2Ab + the second power of B) - (the second power of a - the second power of 2Ab + the second power of B) is equal to? First simplify and then evaluate 1 / 2x-2 (the second power of X-1 / 3Y) + (- 3 / 2x + the second power of 1 / 3Y), where x = 2 / 3, y is equal to - 2, given that a = the second power of X - 5x, B is equal to the second power of X - 11x + 6, calculate the value of a-2b to the second power of 2x y (only x is the second power), - 2x y (only y is the second power), 3x y (only x is the second power), -XY, find out two similar terms from the four formulas, and merge the two similar terms,
• 11. Given the function f (x) = x ^ 3 / 3, G (x) = T ^ (2 / 3) X-2 / 3T. (1) when t = 8, find the function f9x. When t > 0, f (x) > = g (x) has no effect on any real number Given the function f (x) = x ^ 3 / 3, G (x) = T ^ (2 / 3) X-2 / 3T. (1) when t = 8, find the monotone interval of the function y = f (x) - G (x); (2) prove that when t > 0, f (x) > = g (x) holds for any real number; (3) if there is a positive real number X., such that
• 12. If the function y = f (x) satisfies f (a + b) = f (a) + F (b) for all real numbers a and B, and f (1) = 8, then f (- 1 / 2)=_________
• 13. It is known that f (AB) = f (a) + F (b) holds for any positive real number a and B (1) Finding the value of F (1) (2) If f (2) = P, f (3) = q (P, q are constant), find the value of F (36) - f (1 / 36) Great guys, please let me know the process,
• 14. It is known that: a = B + 2, the absolute value of C is 3, m, n are reciprocal, try to find the algebraic formula (a-b) / 5 + 4mn-c ^ 2
• 15. What is the absolute value of 5a-2b?
• 16. Three mutually unequal rational numbers can be expressed in the form of 1, a + B, a, or in the form of 0, B, B of a, then a = ()
• 17. It is known that there are three mutually unequal rational numbers 1, a + B, a, which can be expressed as 0, B / A, B, and | x | = 2, Find (a + b) 2 + (AB) 3 - (a + b-ab) + X & # 178;
• 18. If three mutually unequal rational numbers can be expressed in the form of 1, a, a + B, or 0, B,
• 19. Three unequal rational numbers can be expressed as either 1 A + B a or 0 B / A Try to find the value of 2011 power of a + 2012 power of B
• 20. If | x | = 1, find the value of (a + b) 2013 + (AB) 2014 - (a + b-ab) x + x2