If a, B are opposite to each other, m and N are reciprocal to each other, find - 2a-b + 3 of 2Mn

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• 1. Given that - 1 / 3 ^ 2A ^ m-1b ^ 2 = 4 ^ 3A ^ 2B ^ n-1 is a similar term, try to judge whether x = (M + n) / 2 is the solution of the equation - 2x-6 = 0
• 2. First simplify, then evaluate: LX + 1 − 1x2 − 1 △ x + 1x2 − 2x + 1, where x = 3-1
• 3. If a new operation a * b = AB / 2A + 3b is defined, then (- 3) * 1 =?
• 4. If a and B are rational numbers, we define a new operation "*" such that a ⁃ B = 2a-b, then (5 ⁃ 3) ⁃ 1=______ ．
• 5. Define AB = A & # 178; - B, then [(1 -) 2] (- 3)=
• 6. Define a kind of operation with ＊: for rational number a, B, there is a ＊ B = A & # 178; + ab. if (- 3) ＊ x = 15, then the value of X is ()
• 7. Define an operation in the range of rational number, the rule is: a * b = ab-b & # 178; (1) if (2x + 1) * - 3) = 0, find the value of X
• 8. Now we define the operation a ⊕ B = AB, a ⊗ B = a (1-B), then M2 ⊗ (m ⊕ n)=______ ．
• 9. If a new operation a * b = A-B & #, then (- 5 * 3) * - 2=
• 10. A new operation is defined, which defines a ∧ B = A2 + 2Ab, such as 3 ∧ (- 2) = 3 & # 178; + 2 × 3 is called (- 2) = - 3 1. Find the value of 2 × (- 1) 2. If 2 × (an unknown number) = 2, find the value of X 3. If - 2 ＊× = 2 + ×, find the value of ×
• 11. Given m = {2, a, B}, n = {2a, 2, B}, if M = n, find the value of real number a, B
• 12. Given | a + 1 | + (b-2) 2 = 0, find the value of 2A2 - [8ab + 12 (ab-4a2)] - 12ab
• 13. When a = 1, B = - 2, find the square of [(a + 2 / 1b) + (A-2 / b)] (2a-2 / b)
• 14. [(a + 2 / 1b) squared - (A-2 / 1b) squared] (2a-2 / 1b) (2 / 1b + 2a) multiplied by (4 / 1b squared + 4A squared), where a = - 1, B = 2
• 15. Simple operation of 3 / 8 × 7 + 3 / 8 I want to know if my steps are right
• 16. 1998×(111−12009)+11×(11998−12009)−2009×(111+11998)+3=______ ．
• 17. A simple mathematical calculation 13 out of 49 by 21 plus 13 out of 49 by 28
• 18. (10-1 / 25) / 99.6
• 19. How to calculate 1 / 10-5 + 6 / 5
• 20. How to calculate 10.1 times 88?