3's Square-1 = 8 * 1, 5's Square-1 = 8 * 3, 7's Square-1 = 8 * 6, 9's Square-1 = 8 * 10, find the rule

N is the nth term: the square of (2n + 1) - 1 = 8 * (the square of N + n) / 2

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1. Find the rule 1 + 1.2 + 3.3 + 5.1 + 7.2 + 9.3 + 11.1 + 13, 2 + 15. What's the 80th formula? How many formula is 1 + 73?
2. The 40th formula of 1 + 1,2 + 3,3 + 5,1 + 7,2 + 9,3 + 11,1 + 13
3. A simple method of multiplying 98 by 102 minus 99
4. Is 4 / 5 times 99 plus 4 / 5 using the law of multiplicative distribution
5. 19 times 99 plus 19
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7. If the meaning of the symbol * is a * b = a.b/a + B, find 2 * 3 * 4
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9. If the square of 8y-1 and the square of 8-x are opposite to each other, find the cube of X-Y
10. The square of (1 + 3Y) (3y-1) - 3 (1 + 2Y) (2y-1) + (4Y + 1) =?
11. 3-square-1 = 1 * 8; 5-square-1 = 3 * 8; 7-square-1 = 6 * 8; why? ditto
12. Forget the formula, mathematics always forget that forget this, what problem formula can't remember. Ah A method of solving equations is called formula method!
13. First question: The second power of (M + n) - the second power of 4N= Second question: The fourth power of X - the second power of 2x, the second power of Y + the fourth power of Y= Third question: The second power of 39.8-2 × 39.8 × 49.8 + 49.8= Fourth question: If the quadratic power of M - the quadratic power of n = 8, - M-N = - 4, then the value of M-N is
14. On several mathematics problems in grade two of junior high school 1. For a project, team a will complete it in 40 days. If team B will complete it in 30 days, team a and team B will cooperate for another 20 days ① How many days does it take for engineering team B to do it alone ② The project is divided into two parts, one part of which takes X days, the other part takes y days, where XY is a positive integer and X is a positive integer
15. Some problems in Mathematics in grade two of junior high school 1. Without changing the value of the fraction, change the coefficients in the numerator and denominator of the following formulas into integers (1) (5 / 6 x) + y (2 / 3 x) minus (2 / 3 y) (2) (0.3A) - 2b of (0.7b) Calculate one question: - 2 ≤ one third (1-2x) < 1
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18. 1. There are two experimental fields of wheat with equal area. The first one uses the original variety, and the second one uses the new variety. 9 tons and 15 tons of wheat are harvested respectively. It is known that the average yield of the first experimental field is 3 tons less than that of the second one. The average yield of these two experimental fields per hectare is calculated respectively
19. In mathematics class, Mr. Zhang showed the question: as shown in the figure: △ ABC is an isosceles right triangle, ∠ ACB = 90 °, ab ⊥ BF, point P is any point on BC, and AP ⊥ PF. Is AP equal to PF? If "point P is any point on edge BC" is changed to "point P is any point on extension line of edge CB (except B and C)", other conditions remain unchanged, then is the conclusion still valid? If correct, please draw a graph and write the proof process
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