The set (- 3. - 2. - 1.0.1.2) is represented as

The set (- 3. - 2. - 1.0.1.2) is represented as

{- 1, 1 / 2, 1 / 3, 1 / 4, 1 / 5 }Representation of set by description

{x | x = (- 1) ^ n / N, n is a positive integer}

One half of a number is nine more than one third. What's the number?

Let this number be X
1/2x-1/3x=9
1/6x=9
x=9÷1/6
x=54
A: the number is 54

2007 plus one-half of it to get a number, plus one-third of the number to get a number, plus one-quarter of this time to get a number... And so on, all the way up to one-third of the last time, what's the final number?

2007(1+1/2)(1+1/3)(1+1/4)...(1+1/2007)
=2007*3/2*4/3*5/4...*2007/2006*2008/2007
=2007*2008/2
=2015028

2012 plus one-half of it to get a number, plus one-third of the number to get a number, plus a quarter of this number,
And so on, add it all the way up to one-half of the previous number, then what's the final number

2012*(1+1/2)*(1+1/3)*(1+1/4).（1+1/2012）
=2012*(3/2)*(4/3).(2013/2012)
Cancellation can get 2012 * 2013 / 2 = 2013 * 1006 = 2025078

A rational number a plus one-half of it gets a number, plus one-third of it gets a number again, and so on,
Add it all the way up to one of the last two thousand, and how many times of a is the final number?

According to the meaning of the title
a×（1+1/2）×（1+1/3）×…… ×（1+1/2000）
=a×3/2×4/3×…… ×2001/2000
=a×2001
=2001a
The result is 2001 times of A

One third of a number is 15 more than one half of 38. Find the number

(38×1/2+15)÷1/3
=34÷1/3
=102

Now there are 90 Egyptian scores, one-half, one-third, one-quarter One in 90, one in 91. Can you pick out ten of them and add the sign so that the sum of them equals - 1?

Answer: (- 1) = (- 1 / 5) + (- 1 / 6) + (- 1 / 8) + (- 1 / 9) + (- 1 / 10) + (- 1 / 12) + (- 1 / 15) + (- 1 / 18) + (- 1 / 20) + (- 1 / 24)

One half of a number is 120 more than one third. What's the number?

120÷（1/2-1/3）
=120÷1/6
=720
A: the number is 720

If a certain number is increased by one-third of it is 40, then increasing it by one-half is ()

This number = 40 ÷ (1 + 1 / 3) = 30
Increase 1 / 2 = 30 × (1 + 1 / 2) = 45