Ли). Обчисли, враховуючи, що a + (-а) = 0;
1) 5+(-5);
2) -9 + 9 +7;
3) 4 +(-3) + (-4).
1) 5+(-5);
2) -9 + 9 +7;
3) 4 +(-3) + (-4).
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