Verified answer

Ответ:

1/42

Пошаговое объяснение:

(5 1/6+7 1/7)÷517=1/42

5 1/6+7 1/7=31/6+50/7=

(31×7)+(50×6)/42=217+300/42=517/42

517/42÷527=517/42×1/517=1/42