1. Найди значение выражения: a) 2,8. 16,8' 2 б) 4: 1 3 8 3 B) 1,21 32 3

а) \(\\frac{2.8}{16.8} = \\frac{28}{168} = \\frac{1}{6}\)

б) \(\\frac{2\\frac{1}{4}}{1\\frac{3}{8}} = \\frac{\\frac{9}{4}}{\\frac{11}{8}} = \\frac{9}{4} \\cdot \\frac{8}{11} = \\frac{9 \\cdot 2}{11} = \\frac{18}{11} = 1\\frac{7}{11}\)

в) \(\\frac{1.21}{3\\frac{2}{3}} = \\frac{1.21}{\\frac{11}{3}} = 1.21 \\cdot \\frac{3}{11} = \\frac{121}{100} \\cdot \\frac{3}{11} = \\frac{11 \\cdot 3}{100} = \\frac{33}{100} = 0.33\)