By expanding (1 + 2x-x2) 2, the sum of coefficients of the polynomial is______ ．

∵ (1 + 2x-x2) 2 expansion of the resulting polynomials contain x (except the constant term) ∵ requires the sum of coefficients of the polynomial, substituting x = 1 into (1 + 2x-x2) 2 can ∵ sum of coefficients of the polynomial = (1 + 2 × 1-12) 2 = 4

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1. 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
2. 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_____
3. 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
4. In the expansion of (1 + x) + (1 + x) ^ 2 + (1 + x) ^ 3 +... + (1 + x) ^ n, the coefficient of term x ^ 4 is?
5. In the expansion of (1-x) ^ 5 + (1-x) ^ 6, the coefficient of the term with x ^ 3 is Why C (5,2)
6. 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
7. Given that 3 △ 5 = 34, 4 △ 7 = 65, 11 △ 9 = 202, what is 5 △ 6 equal to?
8. Given that + 3 plus - 2 equals + 1, then + 4 plus - 5 equals ()
9. In the expansion of (x + 1) ^ 6 (AX-1) ^ 2, the coefficient of x ^ 3 is 20 a =?
10. In the expansion of (x + 1) ^ 4 (AX-1) ^ 2, the coefficient of x ^ 3 is 20 a =? Need process drops
11. What is the sum of the coefficients of the polynomial obtained from the square expansion of (1 + 2x-x's Square)
12. The coefficient of X in (1 + 2x) ^ 3 (1-x) ^ 4 expansion is? Don't omit the steps, but the process of solving the problem in detail
13. Find the coefficient of x ^ 5 in (1 + x-x ^ 2) ^ 6 expansion Please explain the process. Thank you The answer is 6
14. Let f (x) = (1 + x) ^ 6 (1-x) ^ 5, then what is the coefficient of x ^ 3 in F '(x)?
15. What is the coefficient of the x ^ 3 term in the (1-x + x ^ 2) (1 + x) ^ 6 expansion
16. Find the coefficient of the x ^ (- 3) term of (x + 1 / x) ^ 6 * (x-1) ^ 3 expansion
17. In the (x-1) - (x-1) ^ 2 + (x-1) ^ 3 - (x-1) ^ 4 + (x-1) ^ 5 expansion, find the coefficient of x ^ 2
18. What is the fifth power of X + the fourth power of X and the second power of Y under the root sign urgent need But also the process
19. If we know that 3 times of X + 2 times of X + X + 1 = 0, then the value of 4 times of X + 3 times of X + 2 times of X + X + 1 is 0
20. Simplify 5 times of X + 4 times of 4x + 3 times of 6x + 2 times of 6x + 2x + 3 4 times (to the fourth power of x)