Номер 1384

1) 5 + (4a – 4) = 5 + 4a – 4 = 4a + 1;

2) 17x – (4x – 5) = 17x – 4x + 5 = 13x + 5;

3) (7b – 4) – (4b + 2) = 7b – 4 – 4b – 2 = 3b – 6;

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

5) (nm) – (–2m – 3n) = nm + 2m + 3n = 4n + m;

6) (–5x + y) – (–2y + 4x) + (7x – 3y) = –5x + y + 2y – 4x + 7x – 3y = –2x.