It is known that the opposite number of X is 3, the absolute value of Y is 4, and the sum of Z and 3 is 0. Find the value of XY + YZ + XZ

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• 1. X = - 3, the absolute value of y = 5, Z + 3 = 0, find the value of xy-yz + XZ
• 2. Let a, B, x, y ∈ R and satisfy A2 + B2 = m, X2 + y2 = n, the maximum value of AX + by is ⊙___ ．
• 3. Given x + y = m, a + B = n, then the maximum value of AX + by is?
• 4. Let a, B, x, y ∈ R and satisfy A2 + B2 = m, X2 + y2 = n, the maximum value of AX + by is ⊙___ ．
• 5. Given that f (x) = the square of ax, (a > 0) when 0 is less than or equal to X and less than or equal to 1, find the minimum value of F (x)
• 6. Given the function f (x) = x square - ax + A / 2 (x is greater than or equal to 0 and less than or equal to 2), if a ∈ R, find the minimum value of F (x)
• 7. Given the two roots of the quadratic equation AX square plus B x plus C equal to zero, this paper proves that ax square plus B x plus C equals a (x minus x1) (x minus x2)
• 8. What is the condition that a is greater than or equal to minus 16 and less than or equal to 0
• 9. Let a, B, C and d be real numbers, and find the values of 2007a + 5B + 8C / 2007x + 5Y + 8Z Let a, B, C, d be real numbers. If the square of a + the square of B + the square of C = 25, the square of X + the square of Y + the square of Z = 36, ax + by + CZ = 30, find 2007a + 5B + 8C / 2007x + 5Y + 8Z, what is the value?
• 10. Given ax ^ 3 = by ^ 3 = CZ ^ 3,1-x + 1-y + 1-z, What's the size relationship between the root sign (AX ^ 2 + by ^ 2 + CZ ^ 2) and the root sign a + B + C
• 11. Given that the opposite number of X is - 3, the absolute value of Y is 0, and the reciprocal of Z is - 1 / 3, try to find the value of XY + YZ + XZ
• 12. It is known that the opposite number of X is 3, the absolute value of Y is 4, and the sum of Z and 3 is 0. Find the value of XY + YZ + XZ
• 13. ax+ay-bx-by=(ax+ay)-( ）=（ ）（ ）
• 14. Using the formula method: given a < B, x < y, try to compare the size of AX + by and BX + ay
• 15. If A-B > 0, then a > B. given A-B > 0, X-Y < 0, compare ax + by and BX + ay If A-B > 0, then a > B. given A-B > 0, X-Y < 0, compare AX = by and BX + ay Urgent excavation, to be handed in tomorrow
• 16. Given that the solution of the system of equations {ax by = 4, BX + ay = 5 is {x = 2, y = 1, then a + B = ()
• 17. It is known that the solution of the system of equations ax + by = 3bx + ay = 7 is x = 2Y = 1, then the value of a + B is () A. 3B. -3C. 103D. −103
• 18. If x = − 2Y = 1 is the solution of the system ax + by = 1bx + ay = 7, then the value of (a + b) · (a-b) is () A. -353B. 353C. -16D. 16
• 19. If the real numbers a, B, X and y satisfy ax + by = 3 and ay BX = 5, then the value of (A2 + B2) (x2 + Y2) is______ ．
• 20. If the real numbers x and y satisfy (X-2) 2 + y2 = 3, then the maximum value of YX is______ ．