If 2x-5y = 0 and X ≠ 0, then the value of 6x − 5y6x + 5Y is______ .
From 2x-5y = 0, we can get 5Y = 2x (x ≠ 0), 6x − 5y6x + 5Y = 6x − 5x6x + 2x = 12 (x ≠ 0)
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- 1. There are 123456 six numbers in total. Every four numbers make up a group of numbers. At the same time, 6 can't be in thousand digits and 1 can't be in single digits. How many combinations are there? Except that 6 can't be in the thousand digits, all other digits are OK, just like 1. Hope to give the method
- 2. Why is there a number n? To judge whether it is prime, we only need to check whether n can be divided by the number between 2 and the root n
- 3. Let F 1 and F 2 be the left and right focal points of hyperbola x ^ 2 / 4-y ^ 2 = I respectively, and point P satisfy ∠ f 1pf 2 = 90 ° on the hyperbola, then the area of △ f 1pf 2 is
- 4. Use 123456 six digits to form six digits without repeated digits (1) how many are adjacent to 135 (2) how many are odd digits and even digits alternating?
- 5. If a and B are not divisible by Prime n + 1, can a ^ N-B ^ n be divisible by N + 1? Can give a proof; can't give a reason,
- 6. The equation of the line with a distance of 55 from the line 2x + y + 1 = 0 is () A. 2X + y = 0b. 2x + Y-2 = 0C. 2x + y = 0 or 2x + Y-2 = 0d. 2x + y = 0 or 2x + y + 2 = 0
- 7. How many odd three digit numbers are there, which are composed of the number 123456
- 8. To prove whether n is prime, we only need to judge whether n can be 2
- 9. Given that the distance between two points a (1,63), B (0,53) and line L is equal to a, and such line l can be made into four, then the value range of a is______ .
- 10. Use the number 123456 to form the number of four digits without repetition and the odd number is not adjacent
- 11. On the problem that C, a, B, C ∈ n *, C cannot be divisible by the square of prime number under the root sign of a + B. find a + B + C Eight spheres with radius of 100 are placed on a horizontal plane. Each sphere is tangent to two adjacent spheres, and their center is the eight vertices of a regular octagon. Now put the ninth sphere on this horizontal plane, so that it is tangent to the eight placed spheres. Let C, a, B, C ∈ n *, C be not divisible by the square of prime. Find a + B + C
- 12. How many permutations are there in 123456
- 13. The distance between two parallel lines L1: 3x + 4Y + 2 = 0, L2: 6x + 8y-4 = 0 is ()
- 14. How to prove that a positive integer n is prime if it cannot be divided by any integer between 2 and root n
- 15. How many combinations can 123456 be composed of six numbers, such as 65432?
- 16. Find the distance between two parallel lines l1:6x + 8y = 11 and l2:3x + 4y-15 = 0
- 17. If the product of some prime numbers is ± 1, the resulting number cannot be divisible by these prime numbers Is there any proof? If the product of some prime numbers is ± 1, the resulting number cannot be divisible by any of these prime numbers.
- 18. The sum of the two numbers is 250, where the quotient of the large number divided by the decimal is 21, and the remainder is 8
- 19. The ratio of the distance from the moving point P (x, y) to the vertex f (1,0) to the distance from it to the fixed line x = 4 is 1:2,
- 20. If a two digit number is not divisible by (), then it must be prime Ask which teacher to help answer, the answer has been known, but I do not know why, for the analysis process. Thank you!