Fill in the brackets with the appropriate number 4 / 1 9 / 1 16 / 1 () (). 2 / 1 6 / 1 12 / 1 20 / 1 30 / 1 () ()

4 / 1 9 / 1 16 / 1 (25 / 1) (36 / 1). (the numerator is square)
2 / 1 6 / 1 12 / 1 20 / 1 30 / 1 (42 / 1) (56 / 1)

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1. 1 / 9 2 / 27 1 / 27 () what do you fill in the brackets? It's a question for civil servants
2. Fill in according to the rules: 2 1 4 3 6 9 8 27 () () what should be filled in the brackets?
3. Find the rules: 2, 3, 4, 9, 8, 27, (). What do you fill in the brackets?
4. 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 ()
5. 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
6. Calculate the following questions (1) 763 + 298 (2) 0.25 * 0.25 * 16 (3) 19.9 * 99 + 19.9 (4) 22 / 23
7. （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
8. How to do 8 out of 27
9. 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)
10. 8 of 7-27 of 14-27 of 13
11. Find the rule and fill in the appropriate number in the brackets. (1) 45, 25, 15______ ，120，______ ，______ ．（2）12，34，98，2716，______ ，______ ．
12. 3 / 4 = 6 / 8 = 9 / 12 = several
13. -9+12÷(-6)-(-4)×(-4)÷(-8)
14. 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?
15. 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
16. 8 / 3 = 30 = 24 / 3 = 4 / 3
17. (): 24 = 3 / 8 = 12 divided by () = () 24 / 8
18. (): 24 = 3 / 8-12 divided by () = 30 ()
19. Two percent plus one sixth plus one twelfth plus one twentieth What's one in 110?
20. One out of two plus one out of six plus one out of twelve plus one out of twenty plus one out of thirty