Write all the monomials with coefficient - 2, including the letters x, y and degree 4

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• 1. The following statements are correct: 1. The coefficient of 2x ^ 2Y is - 2, and the degree is 2.2. (A-1) B is a monomial. 3. X ^ 2 is a quadratic monomial. 4. X-2 is an integral
• 2. If the monomial (- 1 / 7X ^ 3N + 2) y ^ 4 is the same as (5x ^ 8) y ^ 2m-2, then n = () M = ()
• 3. Write out all 4-degree monomials with coefficients of - 2 and only letters A and B
• 4. The coefficient degree of the monomial ab
• 5. As for the coefficient and degree of the monomial - π AB2, the following statement is correct: a. the coefficient is - 1, the degree is 4B. The coefficient is - 1, the degree is 3C. The coefficient is 0, the degree is 3D. The coefficient is - π, the degree is 3
• 6. In the title, one person decomposes the factor 3x & # 178; YZ & # 178; - 6xyz & # 178; + 9xy & # 178; Z & # 178; to get 3xyz (XZ + 2Z + 3yZ), and another person says he is wrong. I think that's right. But according to international practice, this question should let me change the wrong one to the right one. If that's right, it must be wrong. Is it right or wrong?
• 7. If 4x & # 178; YZ & # 179; △ B = - 8x, then B =?
• 8. Simplification: C & # 178; (A & # 178; - B & # 178;) = (A & # 178; + B & # 178;) (A & # 178; - B & # 178;)
• 9. Given - M + 2n = 5, then 3 (m-2n) ^ 2 + 10n-5m-23?
• 10. F (x) = sin (n π - x) cos (n π + x) / cos ((n + 1) π - x) * Tan (x-n π) * cot (n π / 2 + x), find the value of F (π / 6)
• 11. Is 0 a monomial? What are the coefficients and times?
• 12. Can the coefficient in the monomial be 0?
• 13. The coefficient of monomial-1 / 3AB ^ 2
• 14. The coefficient a and the degree of monomial are respectively []
• 15. If - 2mx ^ NY is a quintic monomial about X, y and the coefficient is - 4, find the value of M, n
• 16. If - 2mx ^ NY ^ 2 is a quintic monomial of X, y, and the coefficient is - 4, find the value of 3m-2n
• 17. The factorization of a (AB + BC + AC) - ABC
• 18. If the moving line x = a intersects with the function f (x) = √ 3sin (x + π / 6) and G (x) = cos (π / 3-x) at two points m and N respectively, then the maximum value of | Mn | is
• 19. When the function y = - X3 + 3x + A is used to find the value of a, the equation y = 0 has two real roots
• 20. Given that a and B are positive integers, the two real number roots of the equation x2-2ax + B = 0 for X are X1 and X2, and the two real number roots of the equation Y2 + 2ay + B = 0 for y are Y1 and Y2, and satisfy x1y1-x2y2 = 2008. Find the minimum value of B