3. Add a natural number to the numerator and denominator of the fraction at the same time, which is equal to, to find the natural number? 1997 / 1999 equals 1999 / 2000

(1997 + x) / (1999 + x) = 1999 / 2000, cross multiply 1997 * 2000 + 2000x = 1999 * 1999 + 1999x, merge congeners x = 1999 * 1999-1997 * 2000 = 2001

RELATED INFORMATIONS

1. For a true fraction, the numerator and denominator are two continuous natural numbers. If 3 is added to the denominator, the fraction is 45. The original fraction is 45______ ．
2. For a true fraction, the numerator and denominator are two continuous natural numbers. If 3 is added to the denominator, the fraction is 45. The original fraction is 45______ ．
3. For a true fraction, the numerator and denominator are two continuous natural numbers. If 3 is added to the denominator, the fraction is 45. The original fraction is 45______ ．
4. The numerator and denominator of a true fraction are two continuous natural numbers. If the numerator plus 3 and the fraction is 4 / 5, then the original fraction is () I want to explain that the equation method and the arithmetic method are best,
5. The sum of three consecutive even numbers is 120. What are the three even numbers?
6. The sum of three consecutive even numbers is 120. What are the three even numbers?
7. The product of three natural numbers is 120, and the sum of two decimals is equal to the third number. Then the sum of these three natural numbers is () urgent!
8. The sum of three consecutive even numbers is 120. What are the three even numbers?
9. The product of the number of years, months and days on the date of 1984 is exactly equal to the product of three continuous natural numbers
10. The product of three natural numbers is 180. The sum of two numbers is equal to the third number. The three numbers are () () () Please fill in the blanks
11. The numerator and denominator of a true fraction are two continuous natural numbers. If the denominator is added with 3, the number becomes 4 / 4 of the total, what is the original fraction?
12. Divide one into seven different unit fractions whose denominator is a nonzero natural number less than 20
13. When the numerator and denominator of the simplest fraction are added with the equal natural number (), the score is reduced to 2 / 3
14. Does the result of sixth grade calculation need to be changed into a band score
15. The result of fractional multiplication: if it is a false fraction, do you need to convert it into a band fraction?
16. How to change false fraction into band fraction Come on, we're going to have a test tomorrow
17. The false fraction is changed into a band fraction, and the band fraction is changed into a false fraction 34 1 13 7 9 — 3— — 2 — 4 — 9 3 2 9 11
18. In the mixed operation of fractions, does the result need to be changed from fractional to pseudo fractional?
19. In fractions, the numerator of any false fraction is larger than the denominator______ ．
20. All fractions whose numerator is larger than denominator are false fractions, Please tell the reason and explain