Вправи: 1227

1227. Розкрийте дужки:

1) –5a(–1,2b + 0,4c – d) = 6ab – 2ac + 5ad;

2) (–0,2x + 1,25 – 1,5y) • 4z = –0,8xz + z – 6yz;

3) –18 • (–213a + 129b – 256c) = –18 • (–73a) + (–18) • 119b – (–18) • 176c = 42a – 22b + 51c;

4) (123m – 335n – 116) • 15k = 53m • 15k – 185n • 15k – 76 • 15k = 25mk – 54nk – 352k = 25mk – 54nk – 1712k.