Find the law: 1, 1, 2, 3, 5, 8 What's the eighth number

Find the law: 1, 1, 2, 3, 5, 8 What's the eighth number

The sequence 1,1,2,3,5,8,13,21 is fibodyna sequence. The number in this sequence is equal to the sum of the first two numbers, and the eighth number is 21

Find the law: 1 / 1 / 2, 2 / 2, 1 / 3, 2 / 3, 3 / 3, 1 / 4, 2 / 4, 3 / 4 What is the number 2003

There is one denominator and two denominators
Let the denominator of the 2003 number be n
So 1 + 2 + 3 +. + n ≥ 2003 ≥ 1 + 2 + 3 +. + n-1
n（n+1）/2≥2003≥n（n-1）/2
It is found that n = 63
1+2+3+.+62=1953
2003-1953=50
So the number 2003 is 50 / 63

1 + 1 =? 2 + 2 =? 3 + 3 =? Find the rule until 100 + 100

1+1=2
2+2=4
3+3=6
.
100+100=200
Original formula=
2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+.+100
=2+100+4+95.+1+101
=1000

Find the law, 2 / 3, 1 and 1 / 3, 2, 2 and 2 / 3, 3 and 1 / 3, 4, (), (), 6 2. Find the difference between the 100th and 50th numbers One word urgent!

2/3,4/3,6/3,8/3,10/3,12/3,14/3,16/3,18/3…… 2n/3
The 50th number is 2 * 50 / 3
The 100th number is 2 * 100 / 3
2*100/3-2*50/3=100/3

Find the rule - 1 / 2,1 / 3, - 1 / 10,1 / 15, - 1 / 26 ~ the 100th number

Single count - 1 / (n ^ 2) + 1)
When there are two numbers, 1 / (n ^ 2) - 1)
100 number 1 / 9999

Find the rule 2-48-16 32-64 128-256 what is the nth number What's number 2010

2 =2^1
-4 =2^-2
8 =2^3
-16 =2^-4
32 =2^5
-64 =2^-6
128=2^7
-256=2^-8
...
So the nth number is
[(-1)^(n-1)]*2^n
The N-1 power of the previous - 1 is to make the even number negative

1+2+3+4+5+6… +100=______ .

（100+1）×100÷2
=10100÷2
=5050
So the answer is: 5050

There is a column of numbers, arranged according to a certain rule into - 1,3, - 9,27, - 81243,... Where the sum of three consecutive numbers is 1701. Find out the four numbers What else is it? This is a very difficult question. If you have a meeting, you must remember to send the answer below, Today! If you don't send it until tomorrow, it will be late!

This sequence is an equal ratio sequence with a common ratio of - 3
If the first number is a, then the second number is - 3a and the third number is 9A
The sum of the three numbers is a-3a + 9A = 7a = 1701
a=243
-3a=-729
9a=2187

There is a column of numbers, arranged according to a certain rule: - 1,3, - 9,27, - 81243. Where the sum of three adjacent numbers is - 567, then these three numbers are respectively ()

These three numbers are: - 81243, - 729

There is a column of numbers, arranged in a certain rule into - 1,3, - 9,27, - 81243 Where the sum of three adjacent numbers is 1701, and the three numbers are

-1,3,-9,27,-81,243,-729,2187,
-1*(-3)^0,-1*(-3)^1,-1*(-3)^2,-1*(-3)^3,-1*(-3)^4,-1*(-3)^5,-1*(-3)^6.,-1*(-3)^n
243-729+2187=1701
These three numbers are 243, - 7292187