1) \(0,56 \cdot \frac{3}{8} = \frac{56}{100} \cdot \frac{3}{8} = \frac{4 \cdot 14 \cdot 3}{4 \cdot 25 \cdot 8} = \frac{14 \cdot 3}{25 \cdot 8} = \frac{42}{200} = \frac{21}{100} = 0,21\)
Ответ: 0,21
2) \(2\frac{1}{9} \cdot 1,8 = \frac{19}{9} \cdot \frac{18}{10} = \frac{19 \cdot 9 \cdot 2}{9 \cdot 10} = \frac{19 \cdot 2}{10} = \frac{38}{10} = 3,8\)
Ответ: 3,8
3) \(2,448 : \frac{8}{9} = \frac{2448}{1000} : \frac{8}{9} = \frac{2448}{1000} \cdot \frac{9}{8} = \frac{8 \cdot 306 \cdot 9}{8 \cdot 1000} = \frac{306 \cdot 9}{1000} = \frac{2754}{1000} = 2,754\)
Ответ: 2,754
4) \(8,4 : 1\frac{1}{6} = \frac{84}{10} : \frac{7}{6} = \frac{84}{10} \cdot \frac{6}{7} = \frac{7 \cdot 12 \cdot 6}{10 \cdot 7} = \frac{12 \cdot 6}{10} = \frac{72}{10} = 7,2\)
Ответ: 7,2