The analysis process is as follows:

The dimensions are 1/5 and 3/7.

1/5 and 3/7 are two fractions with different denominators, so we need to divide the comparison sizes first, and we must find the least common multiple of the denominators.

The least common multiple of 5 and 7 is 35.

From this we can get: 1/5=7/35, 3/7= 15/35. Furthermore, it can be concluded that 1/5 is less than 3/7.

Extended data:

The method of comparing scores is as follows:

1, with the same numerator, the smaller the denominator, the greater the score.

For example:1/2 >; 1/3

2. The denominator is the same, and the larger the numerator, the greater the score.

For example: 2/3 >; 1/3

3. If the numerator and denominator are different, divide them first and then compare the sizes.

For example:1/3 (= 4/12) >1/4 (= 3/12).

For two true fractions, if the numerator and denominator differ by the same number, both numerator and denominator have larger scores.

For two false fractions, if the numerator and denominator differ by the same number, the fraction with smaller numerator and denominator is larger.