Розкрий дужки й спрости вираз:

1) 1,8 + (2,5 – a);

2) (5 + b) – 2,8;

3) –(p – 3,9) + 0,1;

4) 7 – (m – 6);

5) (m + 1,3) – (n – 1,7);

6) –(x – 3,9) + (y + 4).
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