The quadratic coefficients of the polynomial xy2-9xy + 5x2y-25 are______ ．

The quadratic term - 9xy of the polynomial xy2-9xy + 5x2y-25 has a coefficient of - 9

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1. The quadratic coefficients of the polynomial XY & # 178; - 9xy + 5x & # 178; Y-8 are
2. It is known that MX ^ N Y is a cubic monomial about XY, and its coefficient is 4. Find the value of m ^ n
3. The monomials 3A & # 179; X, XY, 5x & # 178;, - 4B & # 178; y, a & # 179;, - B & # 178; X & # 178;, 1 / 2 ax & # 178; are classified in different ways (at least two methods)
4. -How to calculate 3x + 6x ^ 2-3x ^ 3
5. 6x²÷3x=? The book says 6x & # 178; △ 3x = 2x, I don't know why, ask the great God to answer
6. The result of factoring the polynomial - 3x ^ 2 - 6x + 12 is
7. Decomposition factor - 5A & # 178; B & # 179; + 20ab & # 178; - 5ab
8. (1) - M quartic + M & # 178; n & # 178; (2) 4 (M + n) & # 178; - 9 (m-n) & # 178; (3) (5a-b) & # 178; + 20ab with factorization factor,
9. First group, then extract the common factor
10. (a-b) - (a-178; - b-178;) refers to the common factor
11. What is the minimum value of X + y + Z = 1, √ (x * 2 + XY + y * 2) + √ (Z * 2 + ZY + y * 2) + √ (x * 2 + XZ + Z * 2)?
12. 1/x+1/y+1/z=1/x^3+1/y^3+1/z^3+3/x^2y+3/xy^2+3/x^2z+3/xz^2+3/y^z+3/yz^2+6/xyz Find the value of 1 / x + 1 / y + 1 / Z
13. Given x + y + Z = 3, XY + YZ + XZ = - 1, XYZ = 2, find x ^ 2Y ^ 2 + y ^ 2Z ^ 2 + x ^ 2Z ^ 2
14. Given 2x-y = - 6, find the value of the algebraic formula [(square of X + square of Y) - (square of X-Y) + 2Y (X-Y)] / 4Y without numbers
15. No matter what values X and Y take, the value of the algebraic formula x minus 4x plus y plus 6x plus 14 is always positive. Please find out the minimum value of this algebraic formula when x and y are of any value?
16. Known: x + y = - 2, a + B = - 1 / 2, the square of X - XY + the square of y = - 1, find the cube of BX + the cube of ay + the cube of by+ Known: x + y = - 2, a + B = - 1 / 2, the square of X - XY + the square of y = - 1, find the value of the cube of BX + the cube of ay + the cube of by + the cube of ax. There's another one: 2 (the square of 2A + the square of a) - 11 (the square of 2A + a) - 6
17. Given that x + y = - 2, a + B = - 1 / 2, x-xy + y = - 1, then the third power of BX + the third power of ay + the third power of by + the third power of AX =?
18. X + y = 3, xy = 1, a + B = 5, ab = 3, M = ax + BX, n = BX + ay, find the value of M3 + N3 Why?
19. Given that x + y = 3, a + B = 5, xy = 1, ab = 3, and M = ax + by, n = BX + ay, find the square of M times the square of n
20. Given x + y = 3, xy = 1, a + B = 5, ab = 3, M = ax + by, n = BX + ay, find the value of m ^ 2n ^ 2