5/7-4/8 --------- 20/7 / и ----- - дробная черта

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вопрос

To solve this, we need to find a common denominator for both fractions.

5/7 - 4/8

First, we need to find a common denominator for 7 and 8, which is 56.

Rewrite the fractions with the common denominator:

(58)/(78) - (47)/(87)
40/56 - 28/56

Now subtract the two fractions:

40/56 - 28/56 = 12/56

Reduce the fraction:

12/56 = 3/14

Therefore, 5/7 - 4/8 = 3/14

Next part of the expression:

20/7 / и

This part is unclear as "и" does not represent a mathematical operation or value. If you can provide more information or clarification, I can continue to help with this calculation.