72. Сложите с помощью координатной 1) –9 и 8; 2) 8 и -9; 5) 2 и -7; - 6) -7 и 2; 8) −1+(-10). прямой числа: 3) 4 и -5; 7) 7 и -2; 4) -5 и 4; 8) -2 и 7.​
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