11 × 29 = 20 square-9 square, 12 × 28 = 20 square-8 square, 13 × 27 = 20 square-7 square ····· 20 × 20 = 20 flat If n products are represented by A1B1, a2b2 ······ anbn, where a1, A2 ······ an, B1 ······ BN are positive numbers, please guess a general conclusion according to the order of products in (1)

If the sum of two numbers is constant, the smaller the difference between the two numbers is, the greater their product is

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1. 8 of 7-27 of 14-27 of 13
2. What is 27 / 20-8 / 45 + 13 / 63? You can use fractions
3. A simple method to calculate (24 + 9 / 4)% 4 25 / 4 + 25 / 4 times 10 57 times 56 / 3 14 / 5% 35 / 4 times 35 / 7 Note: divide by / divide by
4. 75 * 60% 24 * 5 / 3 + 0.6, 75 * 60% + 24 * 3 / 5 + 0.6,
5. A simple calculation of sixth grade score in primary school 4 4 4 4 4 ---＋9---＋99---＋999---＋9999--- 5 5 5 5 5 Sorry, I can't see some of them clearly Four fifths + nine and four fifths + ninety-nine and four fifths + 999 and four fifths + 9999 and four fifths
6. Use 5, 4, 1, 9 and 8, 6, 2, 3 to calculate 24 There are two methods for each of the two formulas. A number can only be used once in three steps
7. 2.35 × 99 × 2 + 4.7 = 0.24 + 1 △ 7 / 8-5 / 6 = 8 / 9 △ 8 / 11 × (3 / 4 + 1 / 6)]=
8. 55x1.4 + (25.2-24.57) 35.55x1.4+(25.2-24.57) 8/15÷【8/3-（7/4+5/6）】
9. 55 x 1.4 + (25.2-24.57) 8 / 15 △ [8 / 3 - (7 / 4 + 5 / 6)] is simple and convenient
10. Simple calculation 25.7 * 0.24 + 7.6 * 2.57
11. How to do 8 out of 27
12. （5）8.6×2.7+3.5×1.6 （6）(0.19×5.4＋2.6×0.19)×12.5 （7）9.99×2.22+3.34×3.33 (8) What is the sum of 1.2 divided by the quotient of 4.2 and the product of 5 and 6.02? Multiple simple operations
13. Calculate the following questions (1) 763 + 298 (2) 0.25 * 0.25 * 16 (3) 19.9 * 99 + 19.9 (4) 22 / 23
14. Take off formula calculation (those that can be simplified should be simplified) ① (1 / 27-1 / 36) △ 1 / 9 ② 8 / 23-9 △ 5 / 6 × 3 / 16
15. A series of numbers (1,1,1); (2,4,8); (3,9,27); (4,16,64) The sum of the three numbers in the tenth bracket is ()
16. Find the rules: 2, 3, 4, 9, 8, 27, (). What do you fill in the brackets?
17. Fill in according to the rules: 2 1 4 3 6 9 8 27 () () what should be filled in the brackets?
18. 1 / 9 2 / 27 1 / 27 () what do you fill in the brackets? It's a question for civil servants
19. Fill in the brackets with the appropriate number 4 / 1 9 / 1 16 / 1 () (). 2 / 1 6 / 1 12 / 1 20 / 1 30 / 1 () ()
20. Find the rule and fill in the appropriate number in the brackets. (1) 45, 25, 15______ ，120，______ ，______ ．（2）12，34，98，2716，______ ，______ ．