ВЫЧЕСЛИ УДОБНИМ СПОСОБОМ
38+29+12+11
9+8+2+21
64+7+6+13
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Answers & Comments
9+8+2+21 = (9 + 21) + (8 + 2) = 30 + 10 = 40
64+7+6+13 = (64 + 6) + (7 + 13) = 70 + 20 = 90