How to find the law of mathematical score 4 / 5 / 25 / 1 () 1 / 20 () ()

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• 1. Additional score 150 points! ~ mathematical emperor to answer! About the score to find the law! Challenge the limit! Kneel` 1 × 1 / 3 = 1 / 2 * (1-1 / 3), 3 × 1 / 5 = 1 / 2 * (1 / 3-1 / 5), 5 × 1 / 7 = 1 / 2 * (1 / 5-1 / 7) It can be calculated according to the observation: 1 × 1 / 3 + 3 × 1 / 5 + 5 × 1 / 7 + +2009 × 2011 1 / 2 =? (urgent, kneel down, tonight! Tell me the law, write down the law in the form of algebra! And the answer) good answer, timely answer, add score 200!
• 2. Let f (x) be a positive real number and f (1 / 2) = 12. For any real number x and y, f (XY) = f (x) + F (y) 3. F (x) is a decreasing function 1) Find the values of F (1 / 4), f (1 / 8), f (1), f (2), f (4) 2) Solution to inequality; f (- x) + F (3-x) ≥ - 2
• 3. Is f (x) = h * TaNx + Y / SiNx an increasing or decreasing function Domain 45=
• 4. If the function y = (2k + 1) x + B is a decreasing function on a real number set, then () A. k＞-12B. k＜-12C. b＞0D. b＜0
• 5. In order to know three points a (1,2), B (4,1), C (3,4), take a point P on the line AB so that the line PQ passing through P and parallel to BC divides the triangle ABC into two parts: the triangle Apq and the quadrilateral pqcb, and their area ratio is s Triangle APQ:S Quadrilateral pqcb = 4:5, find the coordinates of point P There is no picture for this problem. I have to draw it myself. But I don't know how to do it. I want to get the process.
• 6. 1. If the domain of definition of function f (x) = quadratic radical (AX + 2) is (- ∞, 1], find the real number a 2. If the function f (x) = quadratic root sign (AX + 2) is significant in (- ∞, 1], find the real number a 3. If the domain of definition of function f (x) = quadratic root (AX & sup2; + BX + C) is [1,3], find the domain of definition of function f (x) = quadratic root (BX & sup2; - ax + C) I don't understand very well. It's better to have explanation and steps,
• 7. Given that f (√ x + 1) = x + 2 √ x, try to determine the analytic formula F (x) Why can the number of substitution be directly converted to x?
• 8. (1) Given that the definition field of function f (x) = LG (a (the square of x) + ax + 1) is r, the value range of real number a is obtained; (2) given that the value range of function f (x) = LG (a (the square of x) + ax + 1) is r, the value range of real number a is obtained;
• 9. If AB + C = Ba + C = Ca + B = k, then the line y = KX + 2K must pass () A. Quadrant 1 and 2 b. quadrant 2 and 3 C. quadrant 3 and 4 d. quadrant 1 and 4
• 10. Function problem, do me a favor Is y = 3 a positive proportional function? Explain why
• 11. A, B, C, D four players in badminton competition, every two players have to play a game, now a has played three games, B has played two games, D has played one game, then C has played______ Field
• 12. 1,2,4,8… It can be expressed by the formula containing n
• 13. Score by score oral arithmetic questions and answers, do not have no answer and score by integer, more than 80 (try to be more) There should be answers
• 14. The practical problems of multiplying fractions by integers More than 20
• 15. Does integer multiply fraction, decimal multiply fraction and fraction multiply fraction have the same meaning
• 16. What do fractions multiply integers and fractions multiply fractions have in common
• 17. 1. The bottom of a triangle is fixed, and its height is proportional to its area 2. Judgment questions ① If y = 7x (XY is not 0), then x is proportional to y ② A non-zero natural number is inversely proportional to its reciprocal ③ The height of a cylinder is inversely proportional to its volume ④ The distance is proportional to the speed ⑤ The number of copies of juvenile intelligence development newspaper is in direct proportion to the amount of money used ⑥ The number of attendances is inversely proportional to the number of absentees ⑦ If 2A = 3bab is not equal to 0, then B: a = 2:3 3、 Fill in the blank with the serial number 1. The area of a parallelogram is fixed, and its base and height () In proportion, in inverse proportion, out of proportion 2. Below is () Diameter area circumference ratio 3. The sum and difference of the subtracted () In proportion, in inverse proportion, out of proportion
• 18. Qunyi furniture factory sells 1 / 5 of the five drawer cabinets, 120 less than the five drawer cabinets. How many bookcases and five drawer cabinets are sold? Make a cuboid with a volume of 60 cubic decimeters. The bottom is 4 decimeters long and 3 decimeters wide. How many decimeters high should it be? Dongxiang agricultural machinery plant has 39 tons of coal, which has been burned for 16 days, with an average of 1.2 tons per day. If the rest is less than 1.1 tons per day, how many days can it be reduced? The above problems are solved by equations_ ∩) O... Ha ha
• 19. 1. Party A and Party B cooperate to complete a batch of work. At the end of the work, Party A completes four fifths of that of Party B. Party A will be paid according to the amount of work completed. If Party A gets 480 yuan, how much should Party B get? 2. Two thirds of the number a is equal to one fourth of the number B. given that the number a is 15 less than the number B, find the number a? 3. Team a, B and C jointly built a canal. Team a built 30% of the total length, team B built 70 meters more than team a, and team C built 210 meters. How long is the canal? 4. Party A and Party B set out from a and B to go towards each other. When they met, Party A's car traveled 4% less than 8 kilometers of the whole journey, and Party B's car traveled more than 40% more than 32 kilometers of the whole journey. How many kilometers are there between a and B? I want formula ~ formula... I don't want equation
• 20. Ask some questions about sixth grade math 1. The quotient of number a divided by number B is 0.75, number A: number b = (): () 2. With a scale of 20:1, draw a 4 mm watch part on the drawing. The length of the part on the drawing is () 3. The number of safflower is 1 / 4 more than that of safflower, safflower: yellow flower = (): (), yellow flower is less than that of safflower ()