If (y + 1 power of a multiplied by X + 2 power of B) multiplied by (2x-1 power of a multiplied by 2Y power of B) = 3 power of a multiplied by 2 power of B Find the value of X-Y

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• 3. Calculation: (1) LG25 + lg2lg50 + (LG2) 2 (2) 813 + (12) − 2 + (27-1 + 16-2) 0 + 416
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• 15. Let {an} satisfy A0 = a, a (n + 1) = can + 1-C, where a and C are real numbers and C is not equal to 0 Formula for finding general term Let a = 1 / 2, C = 1 / 2, BN = n [1-an}, find the first n terms of BN and Sn
• 16. The general term formula of sequence {an} is an = 1n (n + 1) (n ∈ n *). If the sum of the first n terms is 1011, then the number of terms is______ ．
• 17. It is known that the general term formula of {an} is an = n / (n ^ 2 + 196), and the maximum value of {an} can be obtained It is known that the general formula of {an} is an = n / (n ^ 2 + 196), (n is a positive integer) to find the maximum value of {an}
• 18. A problem of mathematics compulsory 5 in senior one Sequence {an}, Sn = (n + 1) * (n + 7) 1. Find: a1 + A2 + a3 + A4 + A5 + A6 2. Find: A5 + A6 + A7 + A8 + A9 + A10
• 19. Let {an} be an arithmetic sequence, tolerance be 1, and A1, A2, A4 be an arithmetic sequence 1) Finding the general term formula of sequence {an} 2) Let the sum of the first n terms of the sequence {an} be Sn, and find the sum of the first n terms of the sequence {Sn / an} and TN I can only work out an = n, and then I don't know
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