Find the rule 1 + 2 + 3 +. 49 + 50 + 49 +. 3 + 2 + 1=
1+2+3+.49+50+49+.3+2+1=1+2+3+.49+50+50+49+.3+2+1-50=2*(1+2+3+.49+50)-50=2*(1+50)*50/2-50=2550-50=2500
RELATED INFORMATIONS
- 1. Calculate and fill in the blanks 1=1 1+3=4 1+3+5=9 1+3+5+7=16 1+3+5+7+9=25······ 1. Carefully observe the above operations and results, and write the nth equation 2. According to the law: 1 + 3 + 5 + 7 + 9 + ··· + 2013
- 2. Find the rule and fill in the following: 1. 2 × 6 = 12, 3 × 8 = () 48 / 8 = () ②:12÷4=3 ()÷4=() ()×5=() ③:2×6÷4=() ()○()○()=() ()○()○()=() Note: () fill in the number ﹣ fill in × and ﹣ in If you write correctly, you will get higher marks
- 3. In a column of numbers 2,7,14,23. What is the 15th number
- 4. There is a column of numbers, 2, 5, 8, 11, 14 Then 104 is the () th number in this column A. 33B. 32C. 34D. 35
- 5. There is a column of numbers, 2, 5, 8, 11, 14 Then 104 is the () th number in this column A. 33B. 32C. 34D. 35
- 6. The number of this column is arranged according to a certain rule. Fill in the number according to the rule: 1,5,21,85341, () Urgent need
- 7. There is a column of numbers: 1, 6, 11, 16, 21... According to the arrangement of numbers, the 80th number is ()
- 8. Find the rule: 3,6,7,14,15,30
- 9. 31 30 15 14 7 () () 1 7 8 14 15 21 22 () () this is to find rules
- 10. Find rules: 0,1,2,3,6,7,14,15,30,,, 63,64128 Fill in the numbers in brackets
- 11. 1 * 2 * 3 / 1 + 2 * 3 * 4 / 1 + 3 * 4 * 5 / 1 +. 48 * 49 * 50 / 1 simple algorithm you just calculated a problem for me, help me
- 12. 2 + 3 + 4 + 5 +. + 48 + 49 + 50 = how to find the law,
- 13. Find rules 7, 8, 10, - 22, 38
- 14. Find the rules (1) 1,1,1,3,3,5, (), 11 (2) 7,7,16,42107, () (3) 1,2,3,1,4,4,7, (), 6
- 15. (1) 1 / 16,1 / 8,3 / 16,1 / 4, (), () (2) 1,3,4,7,11, (), (), 47 (3)8,4,2,1,1/2,1/4,(),()
- 16. Find the rule first, then fill in the number 2 / 1 / 4 / 3 1 / 8 1 / 16 11 ()( It has to be done now. It's better to have a process, hehe
- 17. What is the law of calculating 2 * 22 * 22 222 * 222 2222 * 2222?
- 18. 2+2+2-2+22-222-2+2222
- 19. What is the sum of the first n terms of the sequence {n * (n + 2)}? Talk more about ideas,
- 20. s=2+22+222+2222+…… +2222…… How to calculate the sum of 2222 (N 2's),