Пошаговое объяснение:
(12 5/13+y)+-9 9/13=7 7/13
(12 5/13+y)=9 9/13+7 7/13
(12 5/13+y)=13 13/13
(12 5/13+y)=14
y=14-12 5/13
y=1 8/13
.
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Пошаговое объяснение:
(12 5/13+y)+-9 9/13=7 7/13
(12 5/13+y)=9 9/13+7 7/13
(12 5/13+y)=13 13/13
(12 5/13+y)=14
y=14-12 5/13
y=1 8/13
.