Is a × 2B × 3C a polynomial or a monomial? What is the coefficient? What is the degree?

The number of monomials is 3 and the coefficient is 6

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1. The coefficient of the monomial a ^ 2B / 7 is 1 / 7, and the degree is 3,
2. (a + b) ^ n if the binomial coefficients of the tenth and eleventh terms are the largest, what is n? How to calculate the required process
3. 1. In the expansion of (5a + 7b) n, the sum of the binomial coefficients of each term is equal to 128, then N 2, find the term with the smallest coefficient in the expansion of (a-b) 10 3. The sum of coefficients of each item in the expansion of (a + b) n is 256. Write the binomial coefficients of the expansion in order 4. Find the sum of coefficients of all terms of the expansion of (a-3b) 6 There should be a process. Thank you
4. Let the sum of binomial coefficients in the expansion of (a-b) n be 256, then the term with the smallest coefficient in the binomial expansion is () A. Item 5 B. items 4 and 5 C. items 5 and 6 D. items 4 and 6
5. In (a + b) 10 expansion, the term with the largest binomial coefficient is (?)
6. In the sixth power of (a + 2b-3c), find: (1) the coefficient of AB squared C cubic and (2) the sum of all the coefficients with a cubic term Thank you very much~
7. What is the sum of binomial coefficients?
8. Square of (1 + x) + X (1 + x) + X (1 + x) + +What is the sum of the coefficients of all binomial expansions of X (1 + x)
9. The 208th power of minus two plus the 207th power of minus two is equal to?
10. What is the 207th power of 0.125 times the 208th power of negative 8
11. 4AB ^ 2-5-3a ^ 2b is the expression of several times and several terms, and the cubic term is 7x ^ 2-5x ^ 3 + 3x-1 are several times and several terms
12. The correct answer to (1 / 3A + 1 / 2b) (1 / 3a-1 / 2b)? Please explain the reason for each step and the whole process (the most important step is to apply the formula)
13. The coefficients and times of X-Y, - A's quadratic, B's cubic + A's cubic, B's quadratic, 2 / 2 x-3 y, 3A's quadratic + 2B's cubic
14. 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
15. 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
16. 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
17. 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
18. 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
19. 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
20. 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