2004 times 2004 plus 2005 out of 2004 times 2005 minus 2005 a=-2005*2005-2005/2004*2004+2004 ，b=-2006*2006-2006/2005*2005+2005 c=-2007*2007-2007/2006*2006+200 Find the value of ABC Be specific

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• 1. Ask a practical mathematical question about calculating costs For example, I buy 200 Jin cucumber I bought it like this 10 Jin and 10 yuan on Monday Tuesday 20 jin 9.5 yuan Wednesday 10 jin 9 yuan Thursday 15 Jin 8.7 Friday 20 7 30 11 on Saturday . Buy a little every day, I want to calculate the average cost of 200 Jin. How to calculate?
• 2. I would like to ask you how to calculate the price of adhesive tape. You'd better give me a list and write it down in mathematics. I'm not good at mathematics. If I can say it out, I'll definitely adopt it. If I don't understand, please don't answer in a disorderly way. I hope there is a God who knows how to ride and how to add,
• 3. Help me with math, about square meters One mu is equal to 666.67 square meters, and the compensation for one mu is 500 yuan. Then I would like to ask how much is the compensation for each square meter! One cent of land is equal to 66.7 square meters, so the area of the house is 66 square meters?
• 4. There is a trapezoid. If the upper bottom is increased by 2 meters, the lower bottom and height will not change. Its area will increase by 4.8 square meters. If the upper bottom and the lower bottom are both unchanged, and the height is increased by 2 meters, its area will increase by 8.5 square meters. Find the area of the original trapezoid
• 5. How to calculate the volume and area of a sphere?
• 6. How to calculate the area of irregular geometry with CAD It mainly calculates the area of irregular geometry, which is composed of irregular curves You can use other software without CAD
• 7. -Square (x-2y) cube of 2A {square (2y-x) cube of-1 / 3AB} Help me
• 8. In the arithmetic sequence {an}, the sum of the first m terms is 77 (M is odd), where the sum of the even terms is 33, and A1 am = 18
• 9. There are odd items in the arithmetic sequence {an}, and the sum of odd items is 77, the sum of even items is 66, A1 = 1. Find the number of items and the middle items
• 10. In the equal ratio sequence {an}, an ＞ 0 (n ∈ n *), common ratio Q ∈ (0, 1), and A3 + A5 = 5, and the middle term of the equal ratio of A3 and A5 is 2. (1) find the general term formula of the sequence {an}; (2) let BN = 5-log2an, the sum of the first n terms of the sequence {BN} be Sn, find the general term formula of the sequence {Sn}; (3) let TN = 1S1 + 1S2 + +1sn, find TN
• 11. What is C (42) a (22) a (33) a (44) a (55) a in mathematical permutation C (11) = 1? What is the relationship between the formula of a and C P
• 12. What is the significance of all kinds of mathematical conjectures?
• 13. Several mathematical reasoning problems 1、 1,7,10,（）,3,4,-1 A.7 B.6 C.8 D.5 2、 6,1,2,19,27,33,（）,48 A.39 B.40 C.41 D.42 3、 0,5,8,1,7,（）,37 A.31 B.27 C.24 D.22 4、 1,2,4,4,1,（） A.16 B.17 C.1/32 D.1/16 5、 10,11,13,34,58,105,（） A.182 B.149 C.134 D.197 6、 1,2,3,7,8,17,15,（） A.31 B.10 C.9 D.25 7、 0,-1,（）,7,28 A.2 B.3 C.4 D.5 8、 3,4,（）,39,103 A.7 B.9 C.11 D.12 9、 1,7,24,33,46,（）,92 A.65,B.67 C.69 D.71 The most important thing is the process
• 14. Among the 200 young workers in a certain unit, the proportion of Party members is more than 80% and less than 81%, of which the longest serving is 10 years, The shortest one year. How many young workers in this unit joined the party in the same year? A.14 B.15C.16 D.17 D
• 15. 1. 2, 3, 7, 16, (), 321; how many in brackets If you answer right, you will get points!
• 16. A mathematical logical geometric reasoning problem (with graph) 24 questions But why?
• 17. Thank you very much
• 18. Several real math problems in the first year of junior high school 1. Given that X and y are real numbers, and (x - √ 3) & sup2; and | y + 3 | are opposite numbers, try to find the value of X-Y (the result can retain the root sign) 2. It is known that the decimal part of √ 15 is a and the decimal part of √ 15 is B. try to find the value of a + B 3. There is such a question: "find the value of X that makes the equation x · √ x-2009 = 0 tenable." If x · √ x-2009 = 0, then x = 0 or √ x-2009 = 0, that is, x = 0 or x = 2009. Therefore, when x = 0 or x = 2009, the original formula holds Do you think sloppy's answer is correct? If not, please write the correct answer Can you write down the process of solving the problem? thank you! ~
• 19. The gravity of the moon and the sun on the earth forms an energy source. What is it called
• 20. First compare the size of the following formats before answering the question________________ (1) - 3 + 5________ - 3 + 5 (2) - half + quarter________ - half - quarter (3) 0 + 3________ 0-3 Through the above comparison, please analyze and summarize the size relationship between a + B and a + B when a and B are rational numbers 1. Fill in the size equals sign in question 2 and 3