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How can I fill in the nine palace grid with 1-9 numbers
4 9 2
3 5 7
8 1 6
Find the rule: 2,5,10,17 what is the nth term?
The first term is the square of one plus one
The second term is the square of two plus one,
The third term is the square of three plus one
.
The nth term is the square of N + 1
Fill in the blanks: 2,7,11,60, ()
Choose from them, 181223172139
The answer is 181, the rule is 2 ^ 2 + 7 = 11, 7 ^ 2 + 11 = 60, 11 ^ 2 + 60 = 181, that is, the square of the first term plus the second term equals the third term
1: 7 2:12 3:17 4:22 according to the above rule, what is the number of the nth?
n=n:5n+2
7, 12, 17, 22, 27, 32. What's the rule?
Rule: each number is 5.5 times larger than the number in front
This sequence is: arithmetic sequence, the difference is 5
The specific performance is: 7 + 5 = 12, 12 + 5 = 17, 17 + 5 = 22
Find the law, 2,7,12,17,22,... What is the nth number? Find the law (2): 1,8,27,64,... What is the nth number
The first arithmetic sequence
An=5n-3
the second
An = n & # 710; 3 (index)
What are the results of 0.13 × 8 + 1.3 × 0.2 and 5.6 × 8.8 + 0.56 × 12?
0.13×8+1.3×0.2=1.3×0.8+1.3×0.2=1.3×(0.8+0.2)=1.3
Find the rules 1,1,2,3,5,8,13 () and explain the reason
21,34
Find the law - 2, - 5, - 11, - 23 (), ()
Such as the title
-2-3=-5
-5-6=-11,
-11-12=-23
-23-24=-47
-47-48=-96
Find the rule 8 24 72 〔 648 2 5 11 23 〕 95 〕
One more question
The sum of these five numbers is five times of the middle number [the middle number is 8], which is expressed by an equation containing letters
8 24 72 【72*3=216 】 648 2 5 11 23 【23*2+1=47 】95 【95*2+1=191 】
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