Помогите пожалуйста..Как можно быстрее.^_^ буду очень благодарна.
Решать по действиям.
а) -2 × (-5) + 20 ÷ (-2) - 10 × (-1) - 9;
б) -39 × 1/4 ÷ (-3) × (-16).
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