What is the rule 2 + 8 = 15 1 + 3 = 06 4 + 6 = ()

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• 1. 1/2008+2/2008-3/2008-4/2008+5/2008+6/2008-7/2008-8/2008+9/2008+、、、、、、+2005/2008+2006/2008
• 2. What is the sixth pair of numbers (1,2), (4,6), (7,10) arranged according to the following rules
• 3. According to this arrangement, the nth number is represented by an algebraic expression
• 4. Regularly arrange the number of a column: 1, - 2,3, - 4,5, - 6,7, - 8, expressed by the algebraic formula with n
• 5. -2 4 - 8 16 - 32 this group of numbers in what order? With the algebraic expression containing N, thank you
• 6. Observe the law of the following numbers and fill in the blanks: 0,3,8,15,24 ··, then what is its 2005 number? What is the nth number?
• 7. Observe the rules and fill in the blanks: one plus one half, two plus one fourth, three plus one eighth The fifth number is, and the nth number is
• 8. If we observe the law of 1:2,12:4,13:8, then the fifth number is () and the nth number is ()
• 9. Find the sum of 1, negative 2,. 3, negative 4,5, negative 6,7, negative 8.99, negative 100 integers, and calculate the formula
• 10. Find the sum of 1, negative 2,. 3, negative 4,5, negative 6,7, negative 8.99 and negative 100
• 11. Find the rule, -- 1.1/2, -- 1 / 3,1 / 4, -- 1 / 5,1 / 6?
• 12. 1-2+3-4+5-6+… +2007-2008+2009．
• 13. Compare 1 / 2 ^ 2 + 1 / 3 ^ 2 + 1 / 4 ^ 2 +. + 1 / 2008 ^ 2 + 1 / 2009 ^ 2 with 1
• 14. A series of numbers in regular order: 1, 3, 7, 13, 21, 31 What's the number in 2008? It's better to have a formula
• 15. 1 ^ 4 x 2 ^ 4 + 3 ^ 4 x Ten 2007 ^ 4 ten 2008 ^ 4 ten 2009 ^ 4
• 16. As shown in the figure, one triangle needs three sticks, two sticks need five sticks, three sticks need seven sticks, ten sticks need n sticks need how many sticks
• 17. The first figure has 6 triangles, the second figure has 10 triangles, and the third figure has 14 triangles. According to this rule, there are several triangles in n patterns
• 18. As shown in the figure, there is a triangle pattern made up of several small circles. There is a circle on the top layer, and there is one more circle on the bottom layer than on the top layer. There are a total of ten circles on the bottom layer 1. From top to bottom, we have a series of positive integers 1.2.3.4.5 in each circle as shown in the figure below Find the number in the bottom left circle? I know the answer, please tell me how to calculate, it should be arithmetic sequence one 2 3 4 5 6 …… （）（）…… （）（）
• 19. The first graph has three triangles, the second graph has six triangles, the third graph has ten triangles, the fourth graph has fifteen triangles, and the nth graph has several triangles? This topic is adapted... Can't do it
• 20. The diameter of the circular pipe conveying concrete in the construction site is 10 cm. The velocity of concrete in the pipe is 35 meters per minute. A truck of concrete has 7 cubic meters, How many minutes can the whole delivery be completed? (the number obtained shall be kept to one decimal place)