Номер 1172

1) m – (m – x) = m – m + x = x

2) –y – (–y + x) = –y + y – x = –x

3) x + (m – x) = x + m – x = m

4) (x – 1) – (x + 5) = x – 1 – x – 5 = –6

5) –(b – 4) + (4 – b) = –b + 4 + 4 – b = 8 – 2b

6) –(m – 1,3 – x) + (1,2 – x) = –m + 1,3 + x + 1,2 – x = 2,5 – m