Find the rules: first line: 1, second line: 2, 3, third line: 4, 5, 6 According to the above arrangement The third number from left to right in line n (n > = 3) is
The rule is that the last one in the nth row is 1 + 2 + 3 +... + n = n * (n + 1) / 2
So the last one on line n-1 is (n-1) * n / 2
The third number from left to right in the nth row (n > = 3) is (n-1) * n / 2 + 3 = (n ^ 2-N + 6) / 2
RELATED INFORMATIONS
- 1. -1 2 - 3 4 - 5 6 - 7 8 - 9 10 - 11 12 - 13 14 - 15 16 according to this rule, number 2010 from the left should be in several rows and columns
- 2. The famous Leibniz triangle in the world is shown in the figure. The number on the third position from the left is () A. 1132B. 1360C. 1495D. 1660
- 3. The famous Leibniz triangle in the world, as shown in the figure, is the number in the eleventh row from the right to the third position? Fig.1/1 1/2 1/2 1/3 1/6 1/3 1/4 1/12 1/12 1/4 1/5 1/20 1/30 1/20 1/5 1/6 1/30 1/60 1/60 1/30 1/6 1/7 1/42 1/105 1/140 1/105 1/42 1/7 . Find the number in the eleventh row from the right to the third position
- 4. What is the number in the third position from the left of line 40 of the Leibniz triangle? Hope to be able to give reasons
- 5. What is the third number on the left of the tenth line of the Leibniz triangle?
- 6. What is the number of line 8 of the Leibniz triangle from the third position on the left?
- 7. Fill in the numbers according to the rules: 89, 23, 12______ 、932、______ .
- 8. 1. (7 + 4 √ 3) (2 - √ 3) ^ 2 2. √ (1 / 25) ^ 2 - (2 / 5) ^ 2 3. √ 80 * √ 5 - √ 50 * √ 2 4. √ 4 / 3 ÷ 3 / 2 * √ 9 / 8
- 9. (1) 14-50% of 9 / 2-5 / 1 (2) 7 × 80% - 1 × 80% - 0.25 × 80% of 8 / 8
- 10. 5 of 6.5-2 =? 3 of 7 times 2.1 equals? 3-1 and 5 of 8 equals? 80% + 1 of 5 equals? 2 of 3-50% equals? 4 of 7 divided by 80%?
- 11. The numbers of 1, - 1 / 2,1 / 3, - 1 / 4,1 / 5, - 1 / 6 are arranged as follows according to certain rules: the first line is 1, the second line is - 1 / 2 1 / 3, the third line is - 1 / 4 1 / 5 - 1/ 0 - 14 days and 23 hours to the end of the problem The numbers 1, - 1 / 2,1 / 3, - 1 / 4,1 / 5, - 1 / 6 are arranged as follows according to certain rules, First line 1 Second line - 1 / 2 1 / 3 The third line - 1 / 4 1 / 5 - 1 / 6 The fourth line 1 / 7 - 1 / 8 1 / 9 - 1 / 10 The fifth line 1 / 11 - 1 / 12 1 / 12 - 1 / 14 1 / 15 ………… ……………… ………… So, can you write seven numbers from left to right on line 199? Be more specific. I'll hand it in tomorrow
- 12. The first line: 1, the second line: 2, 3, the third line: 4, 5, 6, the fourth line: 7, 8, 9, 10. According to the law, what's the last number in line 10000? The teacher asked us: the first line: 1, the second line: 2, 3, the third line: 4, 5, 6, the fourth line: 7, 8, 9, 10. According to the law, what is the last number in the 10000 line?
- 13. How many integers from 1 to 2010 are not divisible by 2 or 3?
- 14. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
- 15. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
- 16. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
- 17. From 1, 2 How many numbers can be taken out of 2010 positive integers, so that the sum of any three numbers can be divided by 33?
- 18. The sum of three numbers is 7 / 12. If one number is 1 / 10 and the other is 1 / 4, find the third number One minute!!! Hurry, hurry, hurry, hurry, hurry, hurry!!!!!!!!!!!!!!!!!!!!!!!!! one
- 19. 1, 2, 4, 8, 16, what is the number of 2013? What if it's the nth number? Is it the N-1 power of 2?
- 20. The average of a set of data 2,0, negative 2,1,3 is