21 1 2) 7-3 4) 4 15 6 544. Применяя переместительное и сочетательное свойства сложе- ния, найдите сумму: 1 5 1) 3 3 7 1 +4 + 7 + 5 + 5+ 12 8 12 8 7 4 5 1 + 4 6 18 9 18 3) 9 8 7 2) 10% +15% +3% + 4) 15 +11 1 пж пж​
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