1. Fill in the blanks according to the rules, （2）1,8,27,（）125,（） 2 (1) find the unknown X 5 / 3 x + 1 / 10 x = 7 / 5 5x-2.1 small X4 = 9.6 (4-1.6)x=36 2X divided by 5 = 15

1. Questions 4, 9, 16, (25), (36), 49, 64
1、8、27、（64）、125、（216）
2 questions 3 / 5x + 1 / 10x = 7 / 5
x=2
5x-2.1x4=9.6
x=3.6
(4-1.6)x=36
x=15
2X divided by 5 = 15 (if it is divided here, the answer is 37.5; if it is divided, the answer is 1 / 6)
x=37.5

RELATED INFORMATIONS

1. The rules of 100, 81, 49, 36, (), 16, () are as follows
2. Find the rule 1,4,16,36,64100, ()
3. Find the rule: 2, - 4.6, - 8.10, 12.14, - 16, what are the 99th and 100th numbers? Explain why
4. Find the law of Mathematics (2,3), (10,6), (20,11), (9,)
5. Observe the following figures and their corresponding formulas. According to the rule you found, use n to represent 1 + 8 + 16 + 24 + +8N (n is a positive integer)______ ．
6. What is the result of 1 + 8 + 16 + 24 +. + 8N (n is a positive integer)?
7. Observe the following figures and their corresponding formulas. According to the rule you found, use n to represent 1 + 8 + 16 + 24 + +8N (n is a positive integer)______ ．
8. 1 + 8 = 3, 1 + 8 + 16 + 5, 1 + 8 + 16 + 24 = 7, 1 + 8 + 16 + 24 + ··········· + 8N (n is a positive integer)
9. As shown in the figure, observe the figure and its corresponding formula, and calculate 1 + 8 + 16 + 24 + according to the rule you found +The result of 8N (n is a positive integer) is______ ．
10. According to the rule you found, the result of calculating 1 + 8 + 16 + 24 +. + 8N (n is a positive integer) is (expressed in an algebraic expression containing n)
11. Fill in the blanks: 1, 81, 64, 49, (), 25, (), () 2, 2, 3, 5, 8, (), (), 34
12. The solution equation: 2.1 △ x = 0.3, 7.2-x = 4.3, x-0.84x = 0.8, 30 × (x △ 4) = 60, 84 + x = 10.2
13. 3: How to solve the equation? 30% × 2.5 + 3 / 10 × 3.7 + 0.3 × 3.7 is simple and convenient
14. (x+8)(x+6)(x+7)+(x+5)(x+6)(x+7)=(x+5)(x+8)(x+7)+(x+5)(x+8)(x+6)
15. X: 3.5 = 1.4:5.6, 1 / 2:1 / 5 = x: 1 / 10, 36 / x = 1.8:5, 2 / 5: x = 8 / 7:10, 3.6:0.9 = x: 0.15, X: 3 / 5 = 3 / 8:0.05 X: 3.5 = 1.4:5.6, 1 / 2:1 / 5 = x: 1 / 10, 36 / x = 1.8:5, 2 / 5: x = 8 / 7:10, 3.6:0.9 = x: 0.15, X: 3 / 5 = 3 / 8:0.05
16. 8 / x = 0.36 / 0.6
17. (5-x)*3=(7-x)*2 x*（1-0.2）=145-x+8 x*6+x（1+0.1）*5=1518 9+x =(36+x)*0.4
18. （-7/12-5/6+9/8-3/4）x（--36）
19. Given 1 + X + x ^ 2 + x ^ 3 = 0, find the value of X + x ^ 2 + x ^ 3 + x ^ 4 + x ^ 5 + x ^ 6 + x ^ 7 + x ^ 8 If not, how much?
20. (1) (- 1 / 12-1 / 36 + 3 / 4-1 / 6) * (- 48) (2) - 3 / 17 △ 3 * (17 / 5)) (3) - 5 ÷ (- 1 and 2 / 7) * 4 / 5 * (- 2 and 1 / 4) / 7 (4) - 2 of 13 * 3-0.34 * 2 of 7 + 1 of 3 * (- 13) - 5 of 7 * 0.34 (5) (- 1 / 6) / (2 / 3 1-3 / 3 2 + 1 / 15 4)