What are the divisors of the largest two odd numbers? What is the sum of all divisors?

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• 1. Calculation; [(- 1 / 2) - (- 1 / 3) + (- 1 / 4)]
• 2. If the equation x2 + Y2 + DX + ey + F = 0 represents a circle with (2, - 4) as its center and 4 as its radius, then f=______ ．
• 3. Split term formula for summation of sequence
• 4. 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
• 5. 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?
• 6. If a commodity is sold at a fixed price, it will get a profit of 45 yuan per unit. Now, the profit from selling 8 units at a 25% discount is the same as the profit from selling 12 units at a 35 yuan discount. How much is the price of this commodity?
• 7. 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
• 8. 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
• 9. 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)
• 10. If a and B are reciprocal to each other, what is one of 2009 AB equal to 2009/1*a*b
• 11. 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?
• 12. Given that a and B are opposite to each other, and ab is not equal to 0, CD is reciprocal to each other, find the value of a + B-Cd + a of 2013
• 13. Given the circle C: x2 + Y2 + DX + ey + 3 = 0, the circle C is symmetric about the straight line x + Y-1 = 0, the center of the circle is in the second quadrant, and the radius is 2. (I) solve the equation of the circle C; (II) find the equation of the straight line L whose origin is not known is tangent to the circle C, and the intercept on the x-axis and y-axis is equal
• 14. Calculate 2 + 4 + 6 + ···· + 200 according to 1 + 2 + 3 + 4 + ··· + n = n (n + 1) / 2
• 15. The largest two odd divisors are () and the sum of all divisors is ()
• 16. How much is ten and one-third minus four and one-fifth equal to forty-five and eleven eight minus (thirty and two fifths plus eight and eleven eight), etc What's ten and a third minus four and a fifth What's 45 and eight out of eleven minus (30 and two out of five plus eight and eight out of eleven) What's four and a quarter minus one and three sixteenth plus 0.75 There are three questions
• 17. If a is known to be a natural number and a is not equal to 0, then () A.A is reciprocal B.A and a are reciprocal C.A and a are reciprocal each other D. A and - A are reciprocal
• 18. Let the sum of the first n terms of the sequence {an} be Sn, and 2An = Sn + 2n + 1 (n ∈ n *) (I) find A1, A2, A3; (II) prove that the sequence {an + 2} is an equal ratio sequence; (III) find the sum of the first n terms of the sequence {n · an} and TN
• 19. The circle X & sup2; + Y & sup2; + DX + ey + F = 0 is symmetric with respect to the line y = X A.D+E=0 B.D-E=0.C.D+F=0 D.D-F=O
• 20. Calculation of Y · y ^ n 1 - 2Y ^ n * y ^ 2 y ^ n-1y ^ 3 Can you explain every step of simplification? I don't know why it's 2Y ^ n * y ^ 2 y·y^n 1 -2y^n*y^2 y^n-1y^3