Номер 1385

1) 10a + (4 – 4a) = 10a + 4 – 4a = 6a + 4;

2) –(4b – 10) + (4 – 5b) = –4b + 10 + 4 – 5b = –9b + 14;

3) (c – 5d) – (–d + 5c) = c – 5d + d – 5c = –4c – 4d;

4) –(5n + m) + (–4n + 8m) – (2m – 5n) = –5nm – 4n + 8m – 2m + 5m = –4n + 5m.