961. Вычислите, группируя слагаемые.
а) 6+ 38 + 24;
г) 12 + 13 + 17 + 18;
б) 66 + 19 +11; в) 105 + 28 + 15;
д) 26 +11+34 + 9; е) 33 + 28 + 22 + 17. Срочно даю 10 баллов ​
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