If a positive integer can be expressed as the square difference of two positive integers, then the positive integer is called "wisdom number" If a positive integer can be expressed as the square difference of two positive integers, then the positive integer is called "wisdom number". According to your understanding, the following four are not "wisdom number": A2002 B2003 C2004 D2005

Choose a, the form of 2K + 1 or 4K must be wisdom number, the form of wisdom number must be 2K + 1 or 4K, K ≥ 1

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1. Calculate the value of (x + 2) (x-1) - 2 (x-3) & sup2; fast bonus! Use complete square formula or square difference formula to solve it!!!! That's the solution! Process, process!
2. It is known that the first term of positive term sequence an is 1, and for any n belongs to N, 1 / A1A2 + 1 / a2a3 + 1 / Anan + 1 = n / a1an + 1, the sum of the first 10 items is 55 Let BN = 1 / Anan + 2, find the first n terms of BN and Sn
3. Let a > 0 and a ≠ 1, M = loga (A3 + 1), n = loga (A2 + 1), then the relation between M and N is () A. M > NB. M < NC. M = nd
4. A number minus the product of 3 / 2 and 2, the difference is 2 / 5, what's the number
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7. Let TN = 1 / A1A2 + 1 / a2a3 + 1 / a3a4 + +1 / Anan + 1, find TN
8. If AB = m (a > 0, b > 0, m ≠ 1) and logm (b) = 2, then logm (a)=
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10. A positive integer, if 100 is a perfect square, if 168 is another perfect square, then the positive integer is______ ．
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15. If a positive integer can be expressed as the square difference of two positive integers, it is called wisdom number. What is the wisdom number
16. What is five minus two fifths
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