1. Реши примеры.
а) (35 + 18) - 45; г) 42 + 14 + 6 + 18 + 7;
б) (52 - 38) + 29; д) 31 + 23 + 17 + 9;
в) 46 - (19 + 18); е) 6 + 14 + 13 + 7.
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