Номер 1273
1) –0,7 · (–2b + 3c – 5a) = –0,7 · (–2b) + (–0,7) · 3c – 0,7 · (–5a) = 1,4b – 2,1c + 3,5a;
2) (0,8p + 2,7a – 3,9b) · (–2x) = 0,8p · (–2x) + 2,7a · (–2x) – 3,9b · (–2x) = –1,6px – 5,4ax + 7,8bx;
3) (–1 1/3a – 2 1/5b + 1/15c) · 15 = –4/3a · 15 – 11/5b · 15 + 1/15c · 15 = –20a – 33b + c;
4) 10a · (–1/5b + 1 1/2c – 3 4/5y) = 10a · (–1/5b) + 10a · 3/2c – 10a · 19/5y = –2ab + 15ac – 38ay.