Завдання 1301 - 1402 » 1304

Спрости вираз: 1) 4,7a – 15/6a + 21/2a = (47/10 – 15/6 + 21/2)a = (421/30 – 125/30 + 215/30)a = 511/30a; 2) –21/3b + 35/6b – 41/2b = (–24/12 + 310/12 – 46/12) b = –3b; 3) –15/6x + 24/9y + 3/4x – 7/12y = –(15/6 – 3/4)x + (216/36 – 21/36)y = –1(10 - 9)/12x + 1(52 - 21)/36y= 131/36y – 11/12x; 4) –42/7c + 21/3m + 99/14c – 54/9m = (99/14 – 44/14)c + (23/9 – 54/9)m = 55/14c – – 31/9m.