If the solution of the equation 2x + 1 = 3 about X is the same as that of the equation 2-third K-X = 0, find the value of K. why do I calculate that all are equal to 4?

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• 1. Given the quadratic function y = − 12x2 + X + 32, we can solve the following problems: (1) change the quadratic function into the form of y = a (X-H) 2 + K; (2) write the vertex coordinates and symmetry axis of the quadratic function
• 2. How to convert the quadratic function y = x ^ 2-2x + 3 to y = (X-H) ^ 2 + k
• 3. In the (1-2x) ∧ n expansion, the binomial coefficients of the fifth, sixth and seventh terms form an arithmetic sequence, and the constant term in the expansion is obtained
• 4. In the expansion of 1-2x) n, if the binomial coefficients of the second, third and fourth terms form an arithmetic sequence, then the fifth term is
• 5. In binomial expansion, the binomial coefficients of the second, third and fourth terms form an arithmetic sequence, and the constant term in the expansion can be obtained?
• 6. If the binomial coefficients of the second, third and fourth terms in the expansion of (1 + x) ^ n are known to be an arithmetic sequence, then n can be obtained
• 7. It is known that the binomial coefficients of the second term, the third term and the fourth term in the expansion of (2 ＋ x) ∧ n are arithmetic sequence! Given that the binomial coefficients of the second, third and fourth terms in the expansion of (2 ＋ x) ∧ n are equal difference sequence! 1, find the value of N 2, and find the middle term of the expansion
• 8. The coefficients of the second, third and fourth terms of the expansion of (√ x + 1 / x) ^ n are known to form an arithmetic sequence, and N is obtained
• 9. The absolute values of the coefficients of the second, third and fourth terms of the (1-x) ^ n expansion form an arithmetic sequence. Try to find the middle term of the expansion
• 10. The absolute values of the coefficients of the second, third and fourth terms of the (1-x) ^ n expansion form an arithmetic sequence, and the middle term of the expansion is obtained
• 11. When k is equal to what value, the solution of the equation about X is x = 1
• 12. General solutions of the system of equations x (1) + X (2) + X (3) + 2x (4) = 3 2x (1) - x (2) + 3x (3) + 8x (4) = 8 - 3x (1) + 2x (2) - 2x (3) - 9x (4) = - 5x (1) - 2x (2) - 3x (3) = - 4
• 13. 3 / 1-x + 2 / 2 = 1,3 / 2x-6 = 2 / x + 2 + 1,3 / x + 8 = - x, 3-1.2x = 5 / 4-12
• 14. When x = 3, find the value of 3 / 4 [4 / 3 (x-1) - 8] - (- 2x-5 / 3)
• 15. (1):(2X-Y-3)^2 (2):59.8*60.2 (3）198^2 （4）：4(X+1)^2-（2x+5）（2X-5） Questions 1, 2, 3 and 4 need integral calculation
• 16. (x ^ 2 + 2x-8) / (x ^ 3 + 2x ^ 2 + x) / {(X-2) / X. (x + 4) / (x + 1) where x = 4 / 5
• 17. 8（1-X）-4（2X+3）=5(x-2)
• 18. X + 5 / 1 = 3 = 2 / 2 x
• 19. 3-x = 1 and 2 / 5, X=
• 20. Billy 0.3 1.5 = 4.2 x 2 1:4 = 10 1:x