Решите примеры. Нужен развернутый ответ. Срочно. Даю 35 баллов.
1) 10 21/25 - 3 1/5 - 4 7/10 =
2) 7 19/50 - 6,75 + 2,1 =
3) 2 2/5 + 14 2/3 - 0,8 =
4) (4 3/4 - 3,75) + (9 5/6 - 3 17/18) =
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