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 ()

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1. 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
2. Calculate the following questions (1) 763 + 298 (2) 0.25 * 0.25 * 16 (3) 19.9 * 99 + 19.9 (4) 22 / 23
3. （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
4. How to do 8 out of 27
5. 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)
6. 8 of 7-27 of 14-27 of 13
7. What is 27 / 20-8 / 45 + 13 / 63? You can use fractions
8. 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
9. 75 * 60% 24 * 5 / 3 + 0.6, 75 * 60% + 24 * 3 / 5 + 0.6,
10. 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
11. Find the rules: 2, 3, 4, 9, 8, 27, (). What do you fill in the brackets?
12. Fill in according to the rules: 2 1 4 3 6 9 8 27 () () what should be filled in the brackets?
13. 1 / 9 2 / 27 1 / 27 () what do you fill in the brackets? It's a question for civil servants
14. Fill in the brackets with the appropriate number 4 / 1 9 / 1 16 / 1 () (). 2 / 1 6 / 1 12 / 1 20 / 1 30 / 1 () ()
15. Find the rule and fill in the appropriate number in the brackets. (1) 45, 25, 15______ ，120，______ ，______ ．（2）12，34，98，2716，______ ，______ ．
16. 3 / 4 = 6 / 8 = 9 / 12 = several
17. -9+12÷(-6)-(-4)×(-4)÷(-8)
18. 2＝2＝1×2 2+4＝6＝2×3 2+4+6＝12=4×5 2+4+6+8=20=4×5 . 1. We can guess what is the sum of continuous even numbers from 2 to n (n is a natural number)? 2. When n = 10, what is the sum of continuous even numbers from 2 to the tenth?
19. Starting from 2, continuous even numbers are added, and the sum is as follows: 2 + 2 = 2 × 22 + 4 = 6 = 2 × 32 + 4 + 6 = 12 = 3 × 42 + 4 + 6 + 8 = 20 = 4 × 5 (1) What is the sum of N consecutive even numbers from 2? (2) Take n = 6 to verify whether the conclusion of (1) is correct
20. 8 / 3 = 30 = 24 / 3 = 4 / 3