8 / 4 + 2 / 6 + 3 / 9=

8 / 4 + 2 / 6 + 3 / 9=

seven-sixths

2 * 1 / 3 + 3 * 1 / 4 + 4 * 1 / 5 +. + 9 * 1 / 10

1/2-1/10=2/5

1+2+3+4+5+6+7+8+9+10+.+999999+1000000=

1+2+3+4+5+6+7+8+9+10+.+999999+1000000
= （1+1000000）×1000000÷2
=1000001×500000
=500000500000

There is a series of scores, 1 / 1, 1 / 2, 2 / 2, 1 / 3, 2 / 3, 3 / 3, 1 / 4, 7 / 10. What is the 400th score

7 / 10 is the 52nd
The 400th score is 22 / 28

What fraction is known as 1,1 / 2,2 / 2,1 / 2,1 / 3,2 / 3,3 / 3,2 / 3,1 / 3,1 / 4,2 / 4,3 / 4,4 / 4,3 / 4,2 / 4,1 / 4.7/10?

Rule: 1
1/2 2/2 1/2
1/3 2/3 3/3 2/3 1/3
1/4 2/4 3/4 4/4 3/4 2/4 1/4
.7/10
So 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 7 = 88
Or 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 13 = 94

There is a column number: 1 / 1 1 / 2 2 / 2 1 / 2 1 / 3 2 / 3 3 3 2 / 3 1 / 3. What is the score of 7 / 10

There are 2N-1 fractions with n as the denominator
The first 7 / 10 is 1 + 3 + 5 + +17 + 7 = 88 scores;
The second 7 / 10 is 1 + 3 + 5 + +17 + 13 = 94 points
So 7 / 10 is the 88th and 94th score

The minimum common denominator of 3 / 10, 7 / 15 and 9 / 20 is 45 minutes and 1.5 hours
Write a number greater than 1 / 6 and less than 1 / 5
1 / 2 < 3 / 3 () < 3 / 4
If there are 24 boys in class 2 of grade 6, accounting for 12 / 25 of the total number of students in the class, there will be a total of 12 students in the class
Xiaoli is 10 years old, and Xiaojie is 5 years older than her. Five years later, Xiaoli's age will be Xiaojie's

2 in 1.3 2 in 2.50 3 in 3.4

1 / 1; 1 / 2,2 / 2,1 / 2; 1 / 3,2 / 3,3 / 3,2 / 3,1 / 3; 1 / 4,2 / 4,3 / 4,4 / 4,3 / 4,2 / 4,1 / 4... Where 7 / 10 is the () th fraction
The 100th score is ()

She is just like a series of regular sums of numbers
1, 3, 5, 7, 9…… 2n-1
By the end of 9, there are 17 scores in a regular row of 9, that is, there are 81 scores in total. There should be two scores in 7 / 10. 7 / 10 is the 81st + 7 = 88 and the 94th
By the end of 10, there are exactly 100 numbers, so the 100th score is 1 / 10

Least common denominator of 1 / 6 and 5 / 8, least common denominator of 1 / 4 and 5 / 12

24,12

21 / 32, 1, 25 / 24, 17 / 18, 43 / 54
A 51/81 B52/81 C53/80 D2/3

21 / 32 = 7 / (32 / 3) = 7 / (5th power of 2 * 1 power of 3) 1 = 16 / 16 = 16 / (2 ^ 4 * 3 ^ 0) 25 / 24 = 25 / (2 ^ 3 * 3 ^ 1) 17 / 18 = 34 / 36 = 34 / (2 ^ 2 * 3 ^ 2) 43 / 54 = 43 / (2 * 3 ^ 3) the denominator is the arithmetic sequence of tolerance 9, so () = (43 + 9) / (2 ^ 0 * 3 ^ 4) = 52 / 81