Given a / 2 = B / 3 = C / 4, find the value of 2A + 3b-4c / 5a-6c emergency Today is the day

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• 1. Given the rational number a, B, C, satisfy | A-1 | + | B-2 | + | C-3 | = 0, please calculate the value of 2A + 3B + 4C
• 2. Let a = (2, - 3), B = (- 4,0), C = (- 5,6), find - 2A + 3b-4c
• 3. If 2A = 3B = 4C, find the value of a: B: C If 2A = 3B = 4C, find the value of a: B: C,
• 4. It is known that 2a-3b-4c = 4 Given 2a-3b-4c = 4, find the value of 4 ^ A / 8 ^ 6 * 1 / 16 ^ C``` You are right on the first floor. These questions hurt brain cells and have to be done. I can't understand a lot of them
• 5. 2a=3b=4c a+b+c+c=800 a=?b c=? 2a=3b=4c a+b+c+c=800 a=?b c=?
• 6. |2a-1 | + | 3b-1 | + | 4c-1 | = 0, find the value of a, B, C
• 7. [A-3] + [B + 4] + [C + 5] = 0, find 2A + 3b-4c
• 8. 1 / 2A = 1 / 3B = 1 / 4C a + B + C = 18 find the value of a, B, C
• 9. Given that the rational numbers a, B, C satisfy | A-1 | + | B-3 | + | C-4 | = 0, calculate 2A + 3B + 4C
• 10. It is known that a > b > C, and 2A + 3B + 4C = 0. (1) proof: a + B + C > 0 It is known that a > b > C and 2A + 3B + 4C = 0 (1) Is a + B + C a positive number? Why? (2) Can the length of the line cut by the parabola y = ax ＾ 2 + BX + C on the x-axis be equal to (root 91) / 6? If you can, find out the equation of symmetry axis of parabola; if not, please explain the reason The solution of 1 2a+3b+4c=(2a+c)+3b+3c Because a > C, 2A + C
• 11. If a = B / 3 = C / 4 and a + B + C = 24, try to find the value of 2A + 3B + 4C
• 12. Calculation: (A's Square - 2b's square + 4) (A's square + 2B's Square - 4)
• 13. The square terms of 3A + 2B are times
• 14. The square of 3A (a-2b) - the cubic of 6 (a-2b)
• 15. How to prove that a square plus b square is greater than or equal to 2Ab In addition, recently, the study of symbols is a bit mixed. When we do questions according to the formula of two numbers and square, do we want to convert the symbols into the same as the formula? For example, the square of [- M-N] should be changed into {[- M] - N}
• 16. It is proved that the square of a plus the square of B is greater than or equal to 2Ab
• 17. Square of a + square of B + 1 / 2 * a * (B-A) - square of 1 / 2B - 1 / 2 * a * (a + b)
• 18. It is known that: a ≠ B, and the square of a-2a-1 = 0, the square of B + 2b-1 = 0, find a + 1 / b And the value of a / b? No dead reckoning
• 19. If there is only one element a in the set a = (x / x square + ax + B = 0), the value of A.B is obtained?
• 20. Problem 1: given the square of set {x | x + ax + B = 0} = {2,3}, find the value of a and B The second problem: represent the set ① {(x, y) | x + y = 6, X ∈ Z, y ∈ Z} ② {- 3, - 1,1,3,5} The third problem: given a = {1,0, - 1,3} B = {y | y = | x |, X ∈ a}, then B?