Вычислите применяя переместительное и сочетательное свойства сложения найдите сумму:
1)3 1/8+7 5/12+1/12:
2) 10 2/5+ 15 5/6+3 3/5+4 1/6:
3)9 7/8+5 2/7+1 1/8+ 4 5/7:
4) 15 7/8+11 8/9+7/9+5/18:
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