1 2 8 () () ()

1 2 8 () () ()

It can be understood that the latter number increases in multiples by 2,4,6,8,10
Answer: 48 384 3840

1,1,2,3,5,8 (), (), (), (), () fill in the regular number in the second grade

Rule: starting with the third term, each term is the sum of the first two
1,1,2,3,5,8（13）,（21）,（34）,（55）

Fill in the blanks according to the rules （1）1，4，9，16， ___ ， ___ ，49，… （2）3，5，9，17， ___ ， ___ ，129 …

（1）52=25，62=36，
The sequence is: 1, 4, 9, 16, 25, 36, 49 ;
（2）17+16=33，33+32=65，
The sequence is: 3, 5, 9, 17, 33, 65129 .
So the answer is: (1) 25,36; (2) 33,65

Find the law: 1,4,9,25,49;

The square of every natural number
The first one: 1 square 1
The second: 2 square 4
The third: 3 square 9
But the landlord seems to be 16
To sum up, 36

1, 4, 9, 16, 25______ ，______ ，64，81．

Because 1 + (3) = 4,
4+（5）=9，
9+（7）=16，
16+（9）=25，
Therefore, 25 + (11) = 36,
36+（13）=49，
Or: 12 = 1
22=4
32=9
42=16
52=25
So 62 = 36
72=49．
So the answer is: 36; 49

Observe the law of the following numbers and fill in the appropriate numbers: 1, - 4,9, - 16,25, - 36,49______ .

According to the meaning of the question, the absolute value of the ordinal number is the square of the ordinal number. If the ordinal number is odd, it is a positive number, and if the ordinal number is even, it is a negative number. To fill in the eighth number, it should be - 82 = - 64; therefore - 64 should be filled in

: find the rule 1,4,9,16,25,36,49,64... From left to right, what is the 20th number?

This law is as follows:
1²=1
2²=4
3²=9.
The 20th number is 20? = 400

-36 - 25 - 16 () () 1 Seek seek seek seek seek seek seek seek seek seek seek

-9 -4.
The difference between every two numbers is - 11. - 9, - 7, - 5, - 3

Fill in numbers 1, 1.3.9.27, (). 243.729, 2, 1.8.27.64, (). 216.343

81, the latter is equal to the former multiplied by 3
Each term is the cube of an adjacent number

Find the rule 1 1 3 4 9 16 27 64 ()

The odd number term
Odd term = previous odd term * 3
Even term = previous even term * 4
So the odd number is required
So 27 * 3 = 81