When listening to fractions, the teacher said that it was meaningful to consider fractions. When should we consider fractions? When should we consider fractions or when should we consider fractions?

At any time, as long as there is a fraction. For example, when considering a fraction, the denominator cannot be zero, and as an example: the meaningful condition of X-1 / X is x ≠ 0

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1. A mathematical problem about fraction If the fractional equation 2 (x + a) / a (x-1) = - 8 / 5 has no solution, then a=____ . the whole process of solving the problem
2. On a problem of mathematical fraction If the reduction result of a fraction is a + 2 / 3, then the value range of a is a ≠ - 3, then 1 / 2 of A-2 appears in the reduction process (or the original formula), then does the value range consider 2?
3. A mathematical problem about fraction in grade two of junior high school When calculating a + [(bc-a ^ 2) / (a ^ 2 + B ^ 2 + C ^ 2)] (a, B, C are not equal to each other), Xiao Fang found that if a and B are exchanged, the value of this formula is unchanged; if a and C are exchanged, the value of this formula is also unchanged. For example, a + B + C = 1, the constant value is obtained Seek a clear solution process
4. A mathematical fraction test Fill in question 15. How did you get it? Why? Because f (n) + F (1 / N) = 1 So f (2) + F (1 / 2) +... + F (n) + F (1 / N) = n-1?
5. During the Dragon Boat Festival, a shop bought a batch of zongzi for 5000 yuan. During the festival, each box was sold at a price of 30% higher than the purchase price, and 80 boxes were sold. After the festival, each box was sold at a price of 5 yuan lower than the purchase price, and the remaining zongzi were sold out. The whole business process made a profit of 1100 yuan. For the purchase price of each box of zongzi, please use the number of boxes to set the fractional equation, not the profit
6. A and B go to the same wholesale market every time to buy white sugar. A's purchasing strategy is to buy 1000 yuan of sugar each time; B's purchasing strategy is to buy 1000 Jin of sugar each time. Recently, they both went to buy sugar with different prices twice. Who's the average price lower?
7. A problem of mathematical fraction ① After learning fractional equation, Xiao Wang found that: A, 1 / a are the two roots of the equation x + 1 / x = a + 1 / A, please verify his conclusion. ② use a conclusion to solve the equation x + 1 / (x-1) = a + 1 / (A-1) I just need the second answer, don't copy it from Baidu, that answer is wrong
8. (xsquare + 7x + 10) / (xsquare + 6x + 5) × (xsquare + 4x + 4) / (xsquare - x + 1) / X-2, where x = 4
9. Eight mathematical fractions (1) Given 1 / X-1 / y = 5, find the value of fraction 3x + 5xy-3y / x-3xy-y (2) Given x + 1 / x = 3, find the value of fraction x ^ 2 + 1 / x ^ 2
10. A few fractional operations, 1. X + 1 / X (x-1) multiplied by "what" = x ^ 2-1 / x ^ 2 2.4 / A ^ 2-1 multiplied by A-1 / 6A 3. X ^ 2-y ^ 2 / X multiplied by - x ^ 2 / (X-Y) ^ 2 =?
11. Fractional mathematical problems one Given x + 1 / y = Z + 1 / x = 1, find the value of Y + 1 / Z two Solution equation: (x-4) / (X-5) - (X-5) / (X-6) = (X-7) / (X-8) - (X-8) (X-9)
12. If the image of the linear function y = (2-m) x = m does not pass through the third quadrant, then the value range of M is Wrong number in the back. It's x + m, Xie 1L
13. In the linear function y = (2m + 2) x + m, y decreases with the increase of X, and its image does not pass through the first quadrant, then the value range of M is () A. m＞-1B. m＜-1C. m=-1D. m＜1
14. In the linear function y = (2m + 2) x + m, y decreases with the increase of X, and its image does not pass through the first quadrant, then the value range of M is () A. m＞-1B. m＜-1C. m=-1D. m＜1
15. It is known that the image of the first-order function y = (2m-1) x + 1-4m of X does not pass through the third quadrant, then the value range of M is
16. If the intersection of the line y = 2X-4 and the line y = 4x + B is in the third quadrant, the value range of B is obtained,
17. We know that the first-order function y = (3m-6) x + m + 1, when m____ The image does not pass through the first quadrant
18. If f (x) = (m ^ 2-1) x + m ^ 2-3m + 2, if f (x) is a decreasing function, and f (x) = 0, if f (x) ≥ x ^ 2, find the value range of X
19. If the line y = 4x + 3m-1 intersects with the line y = x-m-4, and the intersection point is in the third quadrant, then the value range of M is the same
20. Given the square of M - 7m + 2 = 0, the square of Nd - 7n + 2 = 0, find n / M + m / N =?