Конечно, сейчас помогу тебе с этими задачками! Выглядят они немного сложно, но мы справимся.
1) $\left(\frac{14}{20} + 2 \frac{15}{27}\right) \cdot 27 = \left(\frac{7}{10} + \frac{69}{27}\right) \cdot 27 = \left(\frac{7}{10} + \frac{23}{9}\right) \cdot 27 = \left(\frac{63}{90} + \frac{230}{90}\right) \cdot 27 = \frac{293}{90} \cdot 27 = \frac{293 \cdot 3}{10} = \frac{879}{10} = 87,9$
2) $\left(2 \frac{1}{2} - \frac{12}{15}\right) \cdot \frac{1}{34} = \left(\frac{5}{2} - \frac{4}{5}\right) \cdot \frac{1}{34} = \left(\frac{25}{10} - \frac{8}{10}\right) \cdot \frac{1}{34} = \frac{17}{10} \cdot \frac{1}{34} = \frac{1}{10} \cdot \frac{1}{2} = \frac{1}{20} = 0,05$
3) $\left(2 \frac{4}{10} + 1 \frac{13}{20}\right) \cdot \frac{4}{9} = \left(2 \frac{2}{5} + 1 \frac{13}{20}\right) \cdot \frac{4}{9} = \left(\frac{12}{5} + \frac{33}{20}\right) \cdot \frac{4}{9} = \left(\frac{48}{20} + \frac{33}{20}\right) \cdot \frac{4}{9} = \frac{81}{20} \cdot \frac{4}{9} = \frac{9}{5} \cdot \frac{1}{1} = \frac{9}{5} = 1,8$
4) $\left(\frac{8}{16} - 3 \frac{3}{18}\right) \cdot 12 = \left(\frac{1}{2} - 3 \frac{1}{6}\right) \cdot 12 = \left(\frac{1}{2} - \frac{19}{6}\right) \cdot 12 = \left(\frac{3}{6} - \frac{19}{6}\right) \cdot 12 = -\frac{16}{6} \cdot 12 = -\frac{8}{3} \cdot 12 = -8 \cdot 4 = -32$
5) $\left(1 \frac{3}{20} + 2 \frac{7}{10}\right) \cdot \frac{3}{11} = \left(\frac{23}{20} + \frac{27}{10}\right) \cdot \frac{3}{11} = \left(\frac{23}{20} + \frac{54}{20}\right) \cdot \frac{3}{11} = \frac{77}{20} \cdot \frac{3}{11} = \frac{7}{20} \cdot \frac{3}{1} = \frac{21}{20} = 1,05$
6) $1 \frac{8}{16} : \left(4 \frac{13}{14} + \frac{3}{7}\right) = 1 \frac{1}{2} : \left(4 \frac{13}{14} + \frac{6}{14}\right) = \frac{3}{2} : \left(4 \frac{19}{14}\right) = \frac{3}{2} : \left(\frac{75}{14}\right) = \frac{3}{2} \cdot \frac{14}{75} = \frac{1}{1} \cdot \frac{7}{25} = \frac{7}{25} = 0,28$
7) $1 \frac{17}{34} : \left(8 \frac{1}{6} + 2 \frac{6}{24}\right) = 1 \frac{1}{2} : \left(8 \frac{1}{6} + 2 \frac{1}{4}\right) = \frac{3}{2} : \left(\frac{49}{6} + \frac{9}{4}\right) = \frac{3}{2} : \left(\frac{98}{12} + \frac{27}{12}\right) = \frac{3}{2} : \frac{125}{12} = \frac{3}{2} \cdot \frac{12}{125} = \frac{3}{1} \cdot \frac{6}{125} = \frac{18}{125} = 0,144$
8) $2 \frac{11}{36} : \left(1 \frac{3}{27} + 3 \frac{10}{20}\right) = 2 \frac{11}{36} : \left(1 \frac{1}{9} + 3 \frac{1}{2}\right) = \frac{83}{36} : \left(\frac{10}{9} + \frac{7}{2}\right) = \frac{83}{36} : \left(\frac{20}{18} + \frac{63}{18}\right) = \frac{83}{36} : \frac{83}{18} = \frac{1}{2} : \frac{1}{1} = \frac{1}{2} = 0,5$
9) $2 \frac{3}{5} : \left(1 \frac{12}{30} - 1 \frac{10}{27}\right) = \frac{13}{5} : \left(1 \frac{2}{5} - 1 \frac{10}{27}\right) = \frac{13}{5} : \left(\frac{7}{5} - \frac{37}{27}\right) = \frac{13}{5} : \left(\frac{189}{135} - \frac{185}{135}\right) = \frac{13}{5} : \frac{4}{135} = \frac{13}{5} \cdot \frac{135}{4} = \frac{13}{1} \cdot \frac{27}{4} = \frac{351}{4} = 87,75$
10) $18 \frac{1}{5} : \left(2 \frac{12}{30} - 2 \frac{5}{6}\right) = \frac{91}{5} : \left(2 \frac{2}{5} - 2 \frac{5}{6}\right) = \frac{91}{5} : \left(\frac{12}{5} - \frac{17}{6}\right) = \frac{91}{5} : \left(\frac{72}{30} - \frac{85}{30}\right) = \frac{91}{5} : \left(-\frac{13}{30}\right) = \frac{91}{5} \cdot \left(-\frac{30}{13}\right) = \frac{7}{1} \cdot \left(-\frac{6}{1}\right) = -42$
Надеюсь, теперь тебе всё понятно! Если что, спрашивай ещё.
