Чи правильно розкрито дужки:
1.
1) (a
5) + 2 = a – 5 + 2;
2) (m + 3) – (k – 5) = m + 3 – k – 5;
3) 4+ (b − 7) = 4 − b − 7;
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4) – (a + b – c) = −a – b + c?
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