Given that the sum of all coefficients in the expansion of (AX-1 / x) ^ 7 is 128, then the coefficient of x ^ - 5 in the expansion is a.63 b.81 c.21 D. - 21

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• 1. We know that x = 5 is the solution of the equation AX-8 = 20 + A. why is the coefficient a here Why not
• 2. It is known that y is the inverse proportional function of X. when x equals minus 2, y equals 6 Find the inverse proportion
• 3. If - x equals + 6, then x = (); if y = - 1.5, then - y = ()
• 4. If x △ 5 is equal to y △ 6, then x is equal to () and Y is equal to () emergency
• 5. The coefficient of (x + 1) (x-1) ^ 5 expansion with x ^ 2 term is equal to
• 6. （1+x）+（1+x）+… +What is the sum of the coefficients in the expansion of (1 + x) ∧ 10
• 7. In (1 + x) ^ n, the sum of all odd binomial coefficients is 1024. What is the binomial coefficient of the middle term?
• 8. The known function f (x) = cos ^ 2 (x + π / 12) Let f (x) = 1 / 2 [1 + cos (2x + 6 / π)] How did you get here?
• 9. We know that P: F (x) = 1 − X3, and | f (a) | 2, Q: set a = {x | x2 + (a + 2) x + 1 = 0, X ∈ r}, and a ≠ r}. If P or q are true propositions, P and Q are false propositions, we find the value range of real number a
• 10. What is the cubic C of quadratic B of negative 6A plus the cubic C of 2Ab
• 11. In the expansion of (x + 1) ^ 4 (AX-1) ^ 2, the coefficient of x ^ 3 is 20 a =? Need process drops
• 12. In the expansion of (x + 1) ^ 6 (AX-1) ^ 2, the coefficient of x ^ 3 is 20 a =?
• 13. Given that + 3 plus - 2 equals + 1, then + 4 plus - 5 equals ()
• 14. Given that 3 △ 5 = 34, 4 △ 7 = 65, 11 △ 9 = 202, what is 5 △ 6 equal to?
• 15. What is the coefficient of x ^ 3 in the expansion of (x + 2) ^ 6? What we want is how to get the n value of n for C6
• 16. In the expansion of (1-x) ^ 5 + (1-x) ^ 6, the coefficient of the term with x ^ 3 is Why C (5,2)
• 17. In the expansion of (1 + x) + (1 + x) ^ 2 + (1 + x) ^ 3 +... + (1 + x) ^ n, the coefficient of term x ^ 4 is?
• 18. Let the sum of the coefficients of the (5x12 − x13) n expansion be m, the sum of the binomial coefficients be n, and M-N = 992, then the coefficients of the X2 & nbsp; term in the expansion are () A. 250B. -250C. 150D. -150
• 19. The quadratic coefficients of equation 3x (x-1) = 2 (x + 2) + 8 are The coefficient of the first term is, and the constant term is 2) If x = - 1 / 2 is a root of the equation KX ^ 2-x-2 = 0, then K=_______ 3) If the quadratic equation of one variable x ^ 2-6x-5 = 0 is changed into the form of (x + a) ^ 2 = B, then B=_____________ 4) Write a quadratic equation of one variable with x = 3 as a root and the coefficient of quadratic term is 1_____
• 20. The polynomial - 2x ^ 3-x ^ 2 + X-1 is the number of times, the number of terms, the constant term, and the coefficient of the quadratic term