Обчисліть суму: 1) 4 + 2 5; 2) 4 9 + 3 1 9; 3) 3 2 7 + 4 3 7; 4) 5 2 3 + 2 1 3; 5) 2 9 10+ 4 7 10; 6) 1 3 5 + 1 2 5 + 3 1 5.​
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