а) \(\frac{3}{4} \cdot 2 = \frac{3 \cdot 2}{4} = \frac{6}{4} = \frac{3}{2} = 1\frac{1}{2}\)
б) \(\frac{9}{12} \cdot 4 = \frac{9 \cdot 4}{12} = \frac{36}{12} = 3\)
в) \(\frac{7}{15} \cdot 15 = \frac{7 \cdot 15}{15} = 7\)
г) \(\frac{11}{15} \cdot 7 = \frac{11 \cdot 7}{15} = \frac{77}{15} = 5\frac{2}{15}\)
Ответ: а) \(1\frac{1}{2}\); б) 3; в) 7; г) \(5\frac{2}{15}\)