Завдання 1301 - 1402 » 1303

Спрости вираз: 1) 2,7х – 11/2х + 31/3х = (27/10 – 11/2 + 31/3)х = 4(21 - 15 + 10)/30х = 416/30х = 48/15х; 2) 14/7m – 23/14m + 17/42m = (124/42 – 29/42 + 17/42)m = – 10/42m = – 5/21m; 3) –31/3x + 51/6y = – 27/8x – 27/12y = (–31/3 – 27/8)x + (51/6 – 27/12)y = –5(8+21)/24x + (47/6 – 27/12)y = –529/24x + 2(14-7)/12y = –65/24x + 27/12y; 4) –25/9p + 14/9b + 47/18p – 311/27b = (47/18 – 210/18)p + (112/27 – 311/27)b = (325/18 – 210/18)p + (–(238/27 – 112/27))b = 115/18p – 126/27b = 15/6p – 126/27b.