Реши примеры: (11/18 + 2/9) : 5/48; (11/30 - 17/36) : 19/45; (11/10 - 4/11) : 15/44; (17/16 - 1/32) : 11/24; (17/8 - 11/20) : 5/46; 3,9*4,8/14,4; 4,5*3,3/19,8; 2,1*4,2/9,8

Решим примеры по порядку: 1. $(\frac{11}{18} + \frac{2}{9}) : \frac{5}{48} = (\frac{11}{18} + \frac{4}{18}) : \frac{5}{48} = \frac{15}{18} : \frac{5}{48} = \frac{5}{6} : \frac{5}{48} = \frac{5}{6} \cdot \frac{48}{5} = \frac{48}{6} = 8$ 2. $(\frac{11}{30} - \frac{17}{36}) : \frac{19}{45} = (\frac{66}{180} - \frac{85}{180}) : \frac{19}{45} = -\frac{19}{180} : \frac{19}{45} = -\frac{19}{180} \cdot \frac{45}{19} = -\frac{1}{4}$ 3. $(\frac{11}{10} - \frac{4}{11}) : \frac{15}{44} = (\frac{121}{110} - \frac{40}{110}) : \frac{15}{44} = \frac{81}{110} : \frac{15}{44} = \frac{81}{110} \cdot \frac{44}{15} = \frac{81 \cdot 2}{5 \cdot 15} = \frac{27 \cdot 2}{5 \cdot 5} = \frac{54}{25} = 2 \frac{4}{25} = 2,16$ 4. $(\frac{17}{16} - \frac{1}{32}) : \frac{11}{24} = (\frac{34}{32} - \frac{1}{32}) : \frac{11}{24} = \frac{33}{32} : \frac{11}{24} = \frac{33}{32} \cdot \frac{24}{11} = \frac{3 \cdot 3}{4} = \frac{9}{4} = 2 \frac{1}{4} = 2,25$ 5. $(\frac{17}{8} - \frac{11}{20}) : \frac{5}{46} = (\frac{85}{40} - \frac{22}{40}) : \frac{5}{46} = \frac{63}{40} : \frac{5}{46} = \frac{63}{40} \cdot \frac{46}{5} = \frac{63 \cdot 23}{20 \cdot 5} = \frac{1449}{100} = 14,49$ 6. $\frac{3,9 \cdot 4,8}{14,4} = \frac{39 \cdot 48}{144 \cdot 10} = \frac{39 \cdot 4}{12 \cdot 10} = \frac{13 \cdot 1}{1 \cdot 10} = \frac{13}{10} = 1,3$ 7. $\frac{4,5 \cdot 3,3}{19,8} = \frac{45 \cdot 33}{198 \cdot 10} = \frac{5 \cdot 3}{2 \cdot 10} = \frac{15}{20} = \frac{3}{4} = 0,75$ 8. $\frac{2,1 \cdot 4,2}{9,8} = \frac{21 \cdot 42}{98 \cdot 10} = \frac{3 \cdot 6}{2 \cdot 10} = \frac{18}{20} = \frac{9}{10} = 0,9$ Надеюсь, теперь тебе стало понятнее, как решать такие примеры!