The following is a group of numbers arranged in the form of a tower, the first line is 1, the second line is 1 / 2, the third line is 1 / 3, the third line is 1 / 4, the fifth line is 1 / 6, among which

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• 1. If 1, negative half, one third, negative quarter and one fifth are arranged in a tower, what is the fifth number in line 100
• 2. 3. 2 / 5-1 / 3 + 1 / 2 4, 5 / 8 + 2 / 5-3 / 16
• 3. One half equals 0.5, two fifths equals () twelve fifths equals () one eighth equals ()
• 4. Given that the tail of n! Has exactly 106 consecutive zeros, what is the maximum value of natural number n?
• 5. In the product 1 × 2 × 3 × The tail of x n has exactly 106 continuous zeros
• 6. It is proved that n continuous natural numbers can be divided by 1x2x3x4x.xn
• 7. It is proved that if the limit of sequence xn is a, then for any natural number k, the limit of sequence xn + k is a
• 8. If the product of natural number a multiplied by 2376 is the square of natural number B, then a is the smallest______ ．
• 9. a. B is a non-zero natural number, a is not equal to B, 90a + 102b is just a complete square number, find the minimum value of a + B
• 10. Let the square number y ^ 2 be the sum of 11 consecutive positive integers, and find the minimum value of the positive integer y
• 11. 1、 One half, one third, one fourth, one fifth, one sixth What's the number 50? What's the number 2013?
• 12. (1 / 2 + 1 / 3 +... 1 / 2005) times (1-1 / 2 + 1 / 3 +... 1 / 2004) - (1 + 1 / 2 +... 1 / 2005) times (1 / 2 + 1 / 3 +... 1 / 2004)
• 13. 2006 and 2004 1 times 2005 1 how to calculate simply The simpler the better
• 14. How to do 2004 times 2005 times 2006 times 2007 plus 1 (2004 times 2005 times 2006 times 2007 plus 1)
• 15. 2005 times brackets 1 times 1 / 2 plus 2 times 1 / 3 plus 3 times 1 / 4, and so on to 2004 times 1 / 2005, please
• 16. 1, negative half, one third, negative quarter, one fifth, one sixth What is the eighth number and what is the 2003 number?
• 17. How to divide 72 out of 12? How to divide 1 / 2, 5 / 6 and 2 / 3?
• 18. It is judged that (1) two eighths after one fourth of the total score (2) only five out of seven scores are higher than four out of seven scores and lower than six out of seven scores Help me to look at these four judgments and give me the reasons`` 3. With fractional parts, as long as their fractional parts are divided, the integral parts remain unchanged 4. The general score is to increase the score value, and the approximate score is to decrease the score value ()
• 19. Two thirds and one half
• 20. What is half minus four quarters plus four fifths? If you can calculate simply, you need to calculate simply! You need to write a formula