Fill in the numbers regularly. One half, two thirds, three fifths, five eighths. Can you fill in eight twelfth after that I follow the rule of denominator plus one, plus two, plus three, plus four. Then the denominator of the next fraction is twelve. If the numerator is the denominator of the previous fraction, then the numerator of the next fraction is eight. So we can get the first bracket with 8 / 12. According to this category, the second bracket should be filled with 1 / 17 of 12

Fill in the numbers regularly. One half, two thirds, three fifths, five eighths. Can you fill in eight twelfth after that I follow the rule of denominator plus one, plus two, plus three, plus four. Then the denominator of the next fraction is twelve. If the numerator is the denominator of the previous fraction, then the numerator of the next fraction is eight. So we can get the first bracket with 8 / 12. According to this category, the second bracket should be filled with 1 / 17 of 12

It's eight out of thirteen
Look at the number on the denominator:
2.3.5.8
2+3=5
3+5=8
So 5 + 8 is 13
And the numerator is the denominator of the previous number,
So it's eight out of thirteen

Find the rules: one, half, three-thirds, two-quarters. What should I fill in the last two?

5/4,6/4

7, 14, 23, 34, 47
The first number is an expression for finding the nth number

The difference between 7 and 14 is 7
The difference between 14 and 23 is 9
The difference between 23 and 34 is 11
The difference between 34 and 47 is 13
The difference between the last number and the previous number has a certain rule, increasing by 2
Last number = first number + 2 * (n + 1) + 1

Find the law one minus half one third two minus three quarters four fifths

-1 times N / N + 1