Найдите сумму одинаковых слагаемых: 1) -3+(-3)+(-3)+(-3)+(-3)+(-3)+(-3)+(-3)+(-3)+(-3); 2) -7+(-7)+(-7)+(-7)+(-7)+(-7)+(-7)+(-7)+(-7); 3) -50+(-50)+...+(-50)+(-50).
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