Вправи 301 - 400 » 344

Спростіть вираз: 1) 2/3a + 5/8a + 1/6a = (2/3 + 5/8 + 1/6) ∙ a = (2 • 8 + 5 • 3 + 1 • 4)/24 ∙ a = 35/24 ∙ a = 111/24a; 2) 4/5b – 2/3b + 4/15b = (4/5 – 2/3 + 4/15) ∙ b = (4 • 3 - 2 • 5 + 4 • 1)/15 ∙ b = 6/15 ∙ b = 2/5b; 3) 2/5x + 4/7x – 5/145x = (2/5 + 4/7 – 5/14) ∙ x = (2 • 14 + 4 • 10 - 5 • 5)/70 ∙ x = 43/70x; 4) 7/12y – 3/16y + 5/24y = (7/12 – 3/16 + 5/24) ∙ y = (7 • 4 - 3 • 3 + 5 • 2)/48 ∙ y = 29/48y.