-1 / 36 / [- 1 / 9 + 1 / 12 - 1 / 18 + 1 / 36] What's the equivalent?

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• 1. Choose a number from 1 to 9, multiply by 3, add 3, multiply by 3, and then add up ten digits. Why is it always equal to 9? I can't figure it out!
• 2. 3:7 = 3 of 7 = 9 divided by several = 35 parts
• 3. 8.84 divided by 34 divided by 6.5, how to calculate easily
• 4. X divided by 1.2 = 7.2 divided by 6
• 5. Simple calculation 1÷（1×2×3）+1÷（2×3×4）+1÷（3×4×5）+1÷（4×5×6）+.+1÷（98×99×100）
• 6. What are value field and definition field
• 7. What is the difference between the domain of definition and the domain of value in mathematics? Which is for X and which is for y?
• 8. What's the difference between a range and a definition field What does mapping theorem have to do with them
• 9. The difference between value field and definition field
• 10. Y = (1 + 2x) ^ 10-ln2x to find the derivative of Y
• 11. How many meters and decimeters is 9.6 meters?
• 12. The quotient of a number divided by 7 is greater than 7. Find the number Solve by equation
• 13. 4:3-9:7 (8:1-2:4)
• 14. a. The difference between B and a is 737. A is divided by B to get 16, and the rest is 17. A =? B =?
• 15. (3 and 3 / 11 × 25.8-3 and 3 / 11 × 16.76 + 18 / 35 × 19.6) × (1.25-7 / 12 + 5 / 36) × 1 / 29 It's not easy, but please hurry up
• 16. An old man said, "add 17 to my age and multiply it by 1 / 4, then subtract 15 and divide it by 1 / 10. It's exactly 100 years old." how old is this old man this year? (note! We must use formula, not equation ~)
• 17. X divided by a quarter = half
• 18. (3.91 + 3 / 7 + 6.09 + 6 / 7) * (2 / 8-1.125) Simple calculation
• 19. Spend time or money doing something
• 20. If the results of the following two questions are non-zero natural numbers, find the minimum value of R and S (1) r divided by 5 times 1 / 3 (2) 6 / 7 times s divided by 0.6 Want formula + answer