Корова съедает копну сена за 3 дня а коза может съесть такую копну за 7 дней какую часть этой копны они съедят вместе за 1 день
дадададад2
1
28.09.2019 15:45
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3
10/21 этой копны
Пошаговое объяснение:
1/3+1/7=7/21+3/21=10/21