Вправи 301 - 400 » 343

Спростіть вираз: 1) 5/8a ∙ 4/15b = 5/8 ∙ 4/15 ∙ ab = (1 • 1)/(2 • 3) ∙ ab = 1/6ab; 2) 63/4x ∙ 111/45y = 27/4x ∙ 56/45y = 27/4 ∙ 56/45 ∙ xy = (3 • 14)/(1 • 5) ∙ xy = 42/5xy = 82/5xy; 3) 13/24d ∙ 32c = 13/24 ∙ 32/1 ∙ dc = (13 • 4)/(3 • 1) ∙ dc = 52/3dc = 171/3dc.