Negative one, half, negative one-third, quarter Write three numbers after one sixth, what is the number 2005

-1/7 1/8 -1/9
-1/2005

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1. (1 + 1 / 2) × (1 + 1 / 3) × ... × (1 + quarter of two thousand)=
2. 2012 minus 1 / 2, then minus the remaining 1 / 3, then minus the remaining 1 / 4, and so on, until finally minus the remaining 1 / 2012, find the final number
3. A bunch of seed workers take out half of them for the first time, the remaining one third for the second time, and the remaining one fourth for the third time until the remaining one in 2004. How many jin of seeds are left in the end
4. What's the result of subtracting one-half of 2004, the remaining one-third until the last remaining one-third of 2004? What is the result of subtracting one-half of 2004, the remaining one-third, the remaining one-quarter, until the last remaining one-quarter of 2004?
5. Take 4004 and subtract half of it, add the remaining one-third, then subtract one-quarter of the sum, and then add one-fifth of the difference. Finally, subtract one-half of the sum. What's the final result?
6. Subtract half of 2008 and the remaining quarter And so on, until minus the remaining 1 / 2008, the final result is?
7. Subtract one-half of 2008, the remaining one-third, and the remaining one-fifth of the filter until the remaining one-third of 2008 is finally subtracted
8. 2007 minus half of it, then minus the remaining three, until the remaining one in 2007. What's the answer?
9. 2007 minus half of it, and then minus the remaining one-third, until finally minus the remaining one-third of 2007, find the remaining number Please help me!
10. 1997 minus half of it, and then minus the remaining one-third, until minus the remaining 1978, what's the final number? Reason + process = best answer
11. -1, half, minus one-third, quarter. What's the number 2005? If a series goes down, it's closest to that number
12. When m is a value, the solution of the equation 2 △ 3x-3m = 5 (x-m) + 1 is positive?
13. When m takes what value, the solution of the equation 3x + m-2 (M + 2) = 3M + X is between - 5 and 5? （　　） A. -52＜m＜12B. -32＜m＜52C. -72＜m＜32D. -52＜m＜72
14. When m takes what value, the solution of the equation 3x + m-2 (M + 2) = 3M + X is between - 5 and 5? （　　） A. -52＜m＜12B. -32＜m＜52C. -72＜m＜32D. -52＜m＜72
15. When m takes what value, the solution of the equation 3x + m-2 (M + 2) = 3M + X is between - 5 and 5? （　　） A. -52＜m＜12B. -32＜m＜52C. -72＜m＜32D. -52＜m＜72
16. If M + 5 and 3m-7 are opposite to each other, then M =?
17. If 3M + 7 and - 18 are opposite to each other, then M = ()
18. Given that a and B are opposite numbers, M = - (- 2), find the value of 1 / 3M + A / 2008 + B
19. It is known that a and B are opposite to each other, and M is equal to - (- 2). Find the value of 1 / 3M plus a + B
20. Given that a and B are opposite numbers, M = - (- 2), find 1 / 3M plus a + B / 2008