Роздiл 2. Вирази i тотожностi » 110

Спростіть вираз: 1) 11 – (x – (2x – 4)) + 19 = 30 – (x – 2x + 4) = 30 + x – 4 = x + 26; 2) 9с – ((d – с) + 11d) = 9c – (d – c + 11d) = 9c + c – 12d = 10c – 12d; 3) –12m – (11m – (10m + 1)) – 14 = –12m – (11m – 10m – 1) – 14 = –12m – m + 1 – 14 = –13m – 13; 4) За – 0,2(–6b + 2а) – 0,5(а – 4b) = 3a + 1,2b – 0,4a – 0,5a + 2b = 3,2b + 2,1a.