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

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• 1. 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
• 2. 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?
• 3. 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
• 4. 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
• 5. 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
• 6. 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
• 7. 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
• 8. If the coefficients of the first three terms in the expansion of (x ^ 1 / 2 + 1 / (2 ^ 4 * x ^ - 1 / 2)) ^ n form an arithmetic sequence, (1) Find n How to do it? When answering, please use words directly. For example, the 5th power of 3 Or I'll look dizzy
• 9. The difference between two binomials is written as the cubic power of polynomial 3A minus the quadratic power of 2Ab plus the quadratic power of 3A minus the cubic power of negative B If it's children's shoes with newspaper papers, please send out the answer of integral addition and subtraction (3), and you will be given a lot of money
• 10. On the X2 power + (5 + 5b) xy-x + 2x + 7 of the polynomial (A-2) of x y, excluding binomial, finding the value of a-2b? Online and other answers, thank you
• 11. How to convert the quadratic function y = x ^ 2-2x + 3 to y = (X-H) ^ 2 + k
• 12. 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
• 13. 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?
• 14. When k is equal to what value, the solution of the equation about X is x = 1
• 15. 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
• 16. 3 / 1-x + 2 / 2 = 1,3 / 2x-6 = 2 / x + 2 + 1,3 / x + 8 = - x, 3-1.2x = 5 / 4-12
• 17. When x = 3, find the value of 3 / 4 [4 / 3 (x-1) - 8] - (- 2x-5 / 3)
• 18. (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
• 19. (x ^ 2 + 2x-8) / (x ^ 3 + 2x ^ 2 + x) / {(X-2) / X. (x + 4) / (x + 1) where x = 4 / 5
• 20. 8（1-X）-4（2X+3）=5(x-2)