If the solution of the system of equations ax-by-2z = 13, ax + 2Y + CZ = - 2, cx-4y + BZ = 28 is x = 3, y = - 1, z = - 2, find the value of a, B, C

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• 1. Given a ^ 2 + B ^ 2 + C ^ 2 = 1, x ^ 2 + y ^ 2 + C ^ 2 = 9, find the maximum value of AX + by + CZ The answer is 3
• 2. Given a & sup2; + B & sup2; + C & sup2; = 1, X & sup2; + Y & sup2; + Z & sup2; = 1, prove ax + by + CZ ≤ 1 It's easy to understand
• 3. If the solutions of the equations ax by = 8, cy BZ = 1, 2bx + CZ = 5 are x = 1, y = - 2, z = - 1, then what is the number of ABC
• 4. The solution of the system ax + by = 2C CZ + AX = 2B by + CZ = 2A is a. B and C are constant and not 0
• 5. Take any point P in the interior or boundary of △ ABC, and note that the distances from P to three sides a, B, C are x, y, Z in turn. Prove that ax + by + CZ is a constant
• 6. If the solution of the system of equations ax-by-2z = 13 ax + 2Y + CZ = - 2 about X, y and Z is x = 3, y = - 1, z = - 2, cx-4y + BZ = 31, the value adding process of a, B and C is obtained
• 7. When solving the equations {ax + by = 16 ① BX + ay = 19 ②, Xiao Ming copied the equation ① wrong and got the wrong solution {x = 1, y = 7), while Xiao Liang copied the equation ② wrong What is the original system of equations?
• 8. In the system of equations ax + by = 16 1 BX + ay = 19 2, copy 1 wrong to x = 1 y = 1, Xiao Liang copy 2 wrong to x = - 2 y = 4 to find the correct answer 16 and 1 are separated, 1 with a table, 19 and 2 are also not good oral expression
• 9. Xiao Ming and Xiao Liang solve the same system of equations (1) ax + by = 1 (2) BX + ay = - 5. Xiao Ming miscopies (1) and gets the solution as x = - 1, y = 3; while Xiao Liang miscopies (2) and gets the solution as x = 3, y = 2. Can you correctly find the solution of the original system of equations according to the above results?
• 10. To solve the system of equations ax + by = 16 BX + ay = 19, Xiaoming gets x = 1y = 7 and Xiaoliang gets x = - 2Y = 4. To solve the system of equations ax + by = 16 BX + ay = 19, Xiaoming gets x = 1y = 7 and Xiaoliang gets x = - 2Y = 4, how about finding the correct solution and the original equation? As of 10 o'clock, speed answer
• 11. It is known that {x = 1, {y = 2, {z = 3, are the solutions of the equations {ax + by = 2, {by + CZ = 3, {CX + AZ = 7, and the value of a + B + C is obtained
• 12. Let x-by + CZ, y = CZ + ax, z = ax + by, find the value of a / A + 1 + B / B + 1 + C / C + 1
• 13. (x ^ 2 + y ^ 2 + Z ^ 2) (a ^ 2 + B ^ 2 + C ^ 2) = (AX + by + CZ) ^ 2 to prove X / a = Y / b = Z / C
• 14. Given that (a ^ 2) + (b ^ 2) + (C ^ 2) = 1, (x ^ 2) + (y ^ 2) + (Z ^ 2) = 1, prove: ax + by + CZ
• 15. Ax * 3 (the third power of x) = by * 3 = CZ * 3, and 1 / x + 1 / y + 1 / z = 1. Prove (AX * 2 + by * 2 + CZ * 2) * 1 / 3 = a * 1 / 3 + b * 1 / 3 + C * 1 / 3, How to solve this kind of problems,
• 16. 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
• 17. 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?
• 18. What is the condition that a is greater than or equal to minus 16 and less than or equal to 0
• 19. 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)
• 20. 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)