Calculate determinant 1 2 3 n-1 n 1 2 3… n-1 n 1 -1 0… 0 0 0 2 -2… 0 0 …… 0 0 0… n-1 1-n

Add column I to column I + 1 to get (0

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1. The circle x * 2 + y * 2 + DX + ey + F = 0 (d * 2 + e * 2-4f > 0) is symmetric with respect to the straight line y = x + 1. The correct conclusion is d + e = 2 D + e = 1 D-E = 2 d-e=-
2. Senior high school series problems group transformation sum and formula method sum, seek detailed explanation Given the function f (x) = 2 ^ x-3x-1, the sum of the first n terms of an is SN ① Find the maximum value of n that makes an < 0; ② Find SN
3. The reciprocal is greater than or equal to 1 The reciprocal greater than or equal to 1 is () A. True fraction B. any natural number C. false fraction
4. How easy is it to multiply the difference of 7 / 9 plus 1 / 3 minus 4 / 5 by 45
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6. Calculate determinant 1, 2, 2 2 2 2 2 … 2 2 2 3 … 2 … … … … … 2 2 2 … n
7. If the circle x ^ 2 + y ^ 2 + DX + ey + F = 0 (d ^ 2 + e ^ 2-4f) is symmetric with respect to the straight line x + y = 0, then the following equation holds true A、D+E+F=0 B、D+F=0 C、D+E=0 D、E+F=0
8. For senior high school mathematics sequence with reverse order addition, split term method, combination method sum example RT!
9. Given that AB is not equal to 0, and a and B are opposite to each other, find the value of AB + B / A + AB + A / b
10. One third by sixteen five by five fifths 2. (1 / 5 plus 2 / 3) times 15 / 3, 4 / 7 times 9 / 5 plus 3 times 9 / 5 of its branches
11. If a has and only has two divisors, then how many divisors does 7a have?
12. For a rope, cut two fifths of its length for the first time, two thirds of its length for the second time, and two meters for the third time. How long is the rope
13. If a and B are reciprocal to each other, what is one of 2009 AB equal to 2009/1*a*b
14. About high school mathematics sequence sum, how to do? Given an = 2 to the nth power, BN = 2n Find TN = B1 / A1 + B2 / A2 + & ﹥ 8226; & ﹥ 8226; & ﹥ 8226; + BN / an (B is the numerator, a is the denominator)
15. If the circle x ^ 2 + y ^ 2 + DX + ey + F = 0 (d ^ 2 + e ^ 2-4f > 0) is symmetric with respect to the line y = x + 1, then A D+E=2 B D+E=1 C D-E=2 D D-E=1
16. Observe 2 + 1 = 2 ^ 2-1, 2 ^ 2 + 2 + 1 = 2 ^ 3-1, 2 ^ 3 + 2 ^ 2 + 2 + 1 = 2 ^ 4-1 Calculate 2 ^ 9 + 2 ^ 8 + 2 ^ 7 + 2^2+2+1 2^n+2^n-1+… +2^2+2+1
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18. A rope of 2 meters, the first minus two fifths, the second minus one-third more than the first, a total of minus how many meters? I'm sorry to write less words. The original question is: a rope of 2 meters, the first time minus two fifths, the second time minus one third more than the first, how many meters in total?
19. AB is reciprocal to each other, a is equal to 1 ＋ 1 ＋ 1 ＋ 1 ＋ 1 ＋ 1 ＋ a, B is equal to 1 ＋ a ＋ 1 ＋ B
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