The distance from point (1, - 2) to line 4x-3y + 5 = 0 is

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• 1. 4 out of 16 × 7 = 7 out of 9 × 21 = 2 out of 5 △ 5 out of 2 = 1 out of 2 × 3 out of 1 × 5 out of 1 = 9 16 × 4 / 7 ＝ 7 / 9 × 2 / 21 ＝ 2 / 5 ／ 5 / 2 ＝ 1 / 2 × 1 / 3 × 1 / 5 ＝ 2 / 9 × 3 / 2 ＝ 3 / 4 ／ 3 / 5 ＝ 9 ／ 3 / 4 ＝
• 2. Can many netizens prove a mathematical proposition: an odd number greater than 9 is prime if it can't be divided by any one of 3, 5, 7, 9
• 3. Trajectories of points equidistant from two straight lines 3x + 4Y + 5 = 0,4x-3y-7 = 0
• 4. 1+2-3+4+5-9+8+7-0+21
• 5. Is 10001 a prime number? If not, by which numbers can it be divided?
• 6. Given the line 4x + 3Y + 6 = 0 and x = - 1, find the minimum of the sum of the distances between the moving point P on y ^ 2 = 4x and the two lines
• 7. A number is 1 / 9 of 32, 4 / 9 of this number is (), 21 times of the product of 3 / 7 and 2 / 3 is () A number is 1 / 9 of 32, 4 / 5 of this number is (), 21 times of the product of 3 / 7 and 2 / 3 is () Sorry, the wrong number just now.
• 8. 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!
• 9. 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,
• 10. 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
• 11. All prime numbers are not divisible by two______ ．
• 12. 7+1+2=321 4+5-1=416 9+5-4=19 4+2+3=?
• 13. The distance from point C (1, - 2) to the line 4x + 3Y = 0
• 14. Are prime numbers only divisible by 1 and itself, and the rest of the numbers smaller than themselves can't be divisible? Isn't it? Doesn't it include numbers larger than him? For example, 13 can be divided by 130, but only numbers within 13?
• 15. How to calculate 666 + 987 * 654 / 987 * 655-321
• 16. How to find the linear equation with the distance of root sign 5 / 5 from the line 2x + y = 0?
• 17. How to prove that the square root of 2 is irrational
• 18. 666 + 987 * 654 / 987 * 655-321 how to operate easily, and the meaning of each step also need to be improved (1 / 123456788-123456789) △ 1 / 123456788 + 1 / 123456789) the same thing
• 19. Given that the line L1: MX + 8y + n = 0 and L2: 2x + MY-1 = 0 are parallel, and the distance between L1 and L2 is 5, the equation of line L1 is obtained
• 20. Let p be a positive prime and prove that the root P is irrational