What is the definition of simplification? To what extent is it the simplest?

In the drawing room, there is no common divisor for this score
For example, 20 / 5 may be 4 / 1, which means 4 / 1

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1. Using power to simplify meaning (-5)^(2n+1)+5×(-5)^2n+2000^(2n+1)×(1/2000)^2n
2. Is there any difference between "simplifying ratio and seeking ratio" and "simplifying ratio and seeking ratio"? Is "simplifying ratio and finding ratio" done with one formula? Is "simplifying ratio and finding ratio" done with two formulas
3. How to solve 102 = 8A + 8A ^ 2 + 8A ^ 3 + 8 / A ^ 4 + 108a ^ 5 102 = 8A + 8A ^ 2 + 8A ^ 3 + 8A ^ 4 + 108a ^ 5
4. What is 2.8 * 5A?
5. When x is equal to what number, the monomial 5A ^ 2x + 1 and 8A ^ x + 3 are of the same kind
6. Solution equation: √ 18a - √ 1 / 8A + 4 √ 0.5A Calculation questions
7. Given (5x + 1) / [(x-1) (X-2)] = A / (x-1) + B / (X-2), find the value of a-b
8. (X-7 / 4) minus (5x + 8 / 3) = 1
9. Calculate the solution of the equation: X / 60 + X (60-5) / (x + 5) + [15-5x / 60-5x (60-5) / (x + 5) / 60 = x / 60 + (15-x) / 5
10. How to solve 5x = 8x (X-15)
11. What's the difference between XY2 and (XY) 2 I don't know. Does XY2 mean x + 2Y or 2 (x + y)? If x = 3, y = 2, how to calculate these two questions?
12. First simplify and then evaluate: 3x2y - [2xy2-4 (12xy-34x2y) + XY] + 3xy2, where x = 3, y = - 1
13. Given the direct and x-independent of the algebraic formula - 2x & # 178; + ax + BX & # 178; - 5x-1 of X, we can find a and B
14. When x = 3, the value of the algebraic formula ax & # 179; + bx-5 is 7; when x = - 3, what is the value of the algebraic formula ax & # 179; + BX + 5?
15. If the value of the algebraic formula AX3 + BX-1 is 9 when x = - 3, then the value of the algebraic formula AX3 + BX-1 is 9 when x = 3______ ．
16. If 2x ^ 2-kx ^ 3 + 3 is divisible by 2x + 1, the remaining 2 is obtained
17. X (x + 1) = 5x (X-2) by factorization, thank you
18. (5x + 3) (X-7) = 0 by factorization
19. 1. If (1-x) = -0.027, then x =? 3. If {x + y = 5,2x + y = 8, then x + 2Y =? 10. If (1-x) ^ 3 = -0.027, then x =? 11. Calculation. （X-Y)^2-(X+Y)(X-Y) 12. The water charge standard of a city is as follows: the monthly water consumption of each household is not more than 6m ^ 3, and the water charge is 1.6 yuan / m ^ 3. If the monthly water consumption of each household is more than 6m ^ 3, the excess part will be charged by 4 yuan / m ^ 3 per month. Suppose the monthly water consumption of each household is x (m ^ 3), and the water fee payable is y yuan (1) Write the functional relationship between Y and X when the monthly water consumption is not more than 6m ^ 3 and more than 6m ^ 3 (2) It is known that the water consumption of a household in May is 8m ^ 3, so the water charge of the user in May can be calculated (process)
20. The solution of cube = 81 of 3x