Who knows 1 / (1 * 4) - 1 / (4 * 7) - 1 / (7 * 10) - 1 / (10 * 13)... - 1 / (2002 * 2005) - 1 / (2005 * 2008)

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• 1. Calculation: 11 × 4 + 14 × 7 + 17 × 10 + +12005×2008．
• 2. From September 2008 to June 2011, I studied in our high school
• 3. How many days is it from June 20, 2011 to October 26, 2008? rt
• 4. There is a column of numbers: 2,3,6,8,8,4, --- from the third number, each number is a digit of the product of the first two numbers
• 5. In this paper, we give a sequence of numbers: 2, - 4,8, - 16,32... The sixth and seventh numbers are (); the nth number is ()
• 6. -1,2, - 4,8, - 16,32. What is the number of 2007 and 2008 in this column
• 7. Given the quadratic equation 3x + y + 6 = 0, when x and y are opposite to each other, what are x and y equal to?
• 8. It is known that M minus 1 of equation x plus 2m of equation y plus N is equal to 5, which is a quadratic equation of two variables
• 9. If the coordinates of the intersection point of the image of the linear function y = 3x + 7 and the X axis are the solutions of the quadratic equation 2Y KX = 18, then K=
• 10. If the image of the first-order functions Y1 = kxb and y2 = XA is shown in the figure, then the solution of the binary first-order equations y-kx = B Y-X = a is
• 11. 1/（1*4）+1/（4*7）+1/（7*10）+1/（10*13）．．．．．．+1/（2002*2005）+1/（2005*2008）
• 12. The sum of all the digits of the natural number n is 1994, so when the value of n is the smallest, it is () digits and ()
• 13. The sum of several continuous natural numbers is 1994, the smallest of which is () The sum of several continuous natural numbers is 1994, and the smallest one is ()
• 14. If an integer greater than one is removed from 300205243 to leave 15, then this number is equal to ()
• 15. There are five consecutive integers. The sum of the squares of the first three integers is equal to the sum of the squares of the last two integers According to the conditions, the equation is listed and reduced to a general formula
• 16. For five consecutive integers, the sum of squares of the first three numbers equals the sum of squares of the last two numbers
• 17. The sum of five consecutive integers is 300. What's the largest one?
• 18. Five consecutive integers, let the smallest number be X. write the sum of these five numbers; when these five numbers are what numbers, their sum is equal to 300
• 19. How to solve that 3 / y minus 2 / x equals 360?
• 20. (n-2) &; 180 = 5 × 360, how to calculate this