2.304 Найдите значение выражения: a) 3/7 * a при a = 1/2; a=1 1/7; a= 2 1/3; a = 28/33; б) 5/12 * b при b=1/5; b= 1 1/5; b= 2 2/5; b = 11/25.

a) \(\frac{3}{7}a\) 1. a = 1/2: \(\frac{3}{7} \cdot \frac{1}{2} = \frac{3}{14}\) 2. a = 1 1/7: \(\frac{3}{7} \cdot 1\frac{1}{7} = \frac{3}{7} \cdot \frac{8}{7} = \frac{24}{49}\) 3. a = 2 1/3: \(\frac{3}{7} \cdot 2\frac{1}{3} = \frac{3}{7} \cdot \frac{7}{3} = 1\) 4. a = 28/33: \(\frac{3}{7} \cdot \frac{28}{33} = \frac{1}{1} \cdot \frac{4}{11} = \frac{4}{11}\) б) \(\frac{5}{12}b\) 1. b = 1/5: \(\frac{5}{12} \cdot \frac{1}{5} = \frac{1}{12}\) 2. b = 1 1/5: \(\frac{5}{12} \cdot 1\frac{1}{5} = \frac{5}{12} \cdot \frac{6}{5} = \frac{1}{2}\) 3. b = 2 2/5: \(\frac{5}{12} \cdot 2\frac{2}{5} = \frac{5}{12} \cdot \frac{12}{5} = 1\) 4. b = 11/25: \(\frac{5}{12} \cdot \frac{11}{25} = \frac{1}{12} \cdot \frac{11}{5} = \frac{11}{60}\) Ответ: a) 3/14, 24/49, 1, 4/11; б) 1/12, 1/2, 1, 11/60