1 + 2 = 3 = 1 * 3 4 + 4 = 8 = 2 * 4 9 + 6 = 15 = 3 * 5 16 + 8 = 24 = 4 * 6 the law is expressed by the formula containing n

Square of N + 2n = n × (n + 2)

RELATED INFORMATIONS

1. -1,2, - 4,8, - 16,32. According to the law, find the nth number (expressed by the formula containing n) Calculate the following two groups of formulas: (3 × 5) square and 3 × 5 square, [(- 2) × 3] square, and (- 2) square × 3 square. Are the results of each group of two formulas the same? (2) think about what the third power of (AB) equals? (3) guess what the n power of (AB) equals when n is a positive integer? If a = 25 and B = - 3, what is the last digit of a to the power of 2003 and B to the power of 2004?
2. -1,2, - 4,8, - 16,32. According to the law, how can the nth number be expressed by the formula?
3. 1, - 2,3, - 4,5, - 6,7, - 8,9, - 10,11 what are the rules of the group of numbers? Use a formula to express each number
4. -1 + 3-5 + 7-9 + 11... - 1997 + 1999 how to calculate the formula
5. 3-5 + 7-9 + 11-13... + 1995-1997 + 1999 (simple calculation and formula)
6. Find the formula of general term: 4 / 8, 5 / 11, 6 / 14, 7 / 17 There are also 1 / 2, 4 / 3, 6 / 5, 8 / 7
7. 11 * 10 and 1 / 11, simple formula
8. When asked about the mathematical formula, 5 out of 7-5 out of 7 + 8 out of 17 + 9 out of 17
9. How to work out the formula for the problem of 4 / 7 of 2 / 5
10. What are the characteristics of the price amount accounting method
11. The number of a regularly arranged column: - 1,3, - 5,7, - 9,... What formula do you think can be used to express each of its terms?
12. Ask: there is a mathematical symbol *, so that the following formula holds: 2 * 4 = 8,5 * 3 = 13,3 * 5 = 11,9 * 7 = 25, then 7 * 3 =?
13. There is a mathematical operation symbol "0", which makes the following formula true: 12023 = 36, 45079 = 1145, 56017 = 642. Find the value of 311045
14. There is a mathematical operation symbol "0", which makes the following formula true: 12023 = 36, 45079 = 1145, 56017 = 642. Find the value of 311045
15. We define a * b = AB-1 and calculate the value of 5 / 3 * 2=_________
16. Mathematics in the newspaper Specify an operation, a * b = AB / A + B, and calculate the value of 2 * (- 3) 2 * (- 3) = 6. I can do that, too. But the front a * b = AB / A + B,
17. 1.25 times 0.8 times 4 times 2.5 (simple formula)
18. First press 3:1 to enlarge, then press 1:2 to reduce. What's the current area? What's the formula First press 3:1 to enlarge, then press 1:2 to reduce. What is the area now? What's the formula
19. Fill in 1 / 2, 1 / 3, 1 / 6 in each formula to make the equation hold. (fraction + fraction) / fraction = 1
20. If the height of a cone does not change and the radius of its bottom increases by one third, how much does the volume increase? Don't be wrong,