Задание 1. Найдите значение выражения. 1) (17/10 - 1/20) * 2/15...

### Задание 1. Найдите значение выражения 1) $(\frac{17}{10} - \frac{1}{20}) \cdot \frac{2}{15} = (\frac{34}{20} - \frac{1}{20}) \cdot \frac{2}{15} = \frac{33}{20} \cdot \frac{2}{15} = \frac{33 \cdot 2}{20 \cdot 15} = \frac{11 \cdot 1}{10 \cdot 5} = \frac{11}{50} = 0,22$ 2) $(\frac{5}{22} - \frac{8}{11}) \cdot \frac{11}{5} = (\frac{5}{22} - \frac{16}{22}) \cdot \frac{11}{5} = -\frac{11}{22} \cdot \frac{11}{5} = -\frac{1}{2} \cdot \frac{11}{5} = -\frac{11}{10} = -1,1$ 3) $(\frac{5}{26} - \frac{3}{25}) \cdot \frac{13}{2} = (\frac{125 - 78}{650}) \cdot \frac{13}{2} = \frac{47}{650} \cdot \frac{13}{2} = \frac{47}{50 \cdot 2} = \frac{47}{100} = 0,47$ 4) $(\frac{10}{13} + \frac{15}{4}) \cdot \frac{26}{5} = (\frac{40 + 195}{52}) \cdot \frac{26}{5} = \frac{235}{52} \cdot \frac{26}{5} = \frac{47}{2} = 23,5$ 5) $(\frac{17}{26} + \frac{11}{13}) \cdot \frac{17}{6} = (\frac{17}{26} + \frac{22}{26}) \cdot \frac{17}{6} = \frac{39}{26} \cdot \frac{17}{6} = \frac{3}{2} \cdot \frac{17}{6} = \frac{17}{4} = 4,25$ 6) $(\frac{11}{12} + \frac{11}{20}) \cdot \frac{15}{8} = (\frac{55 + 33}{60}) \cdot \frac{15}{8} = \frac{88}{60} \cdot \frac{15}{8} = \frac{11}{4} = 2,75$ 7) $(\frac{3}{4} - \frac{1}{6}) \cdot 3 = (\frac{9}{12} - \frac{2}{12}) \cdot 3 = \frac{7}{12} \cdot 3 = \frac{7}{4} = 1,75$ 8) (\frac{2}{5} + \frac{13}{15}) \cdot 6 = (\frac{6}{15} + \frac{13}{15}) \cdot 6 = \frac{19}{15} \cdot 6 = \frac{19 \cdot 2}{5} = \frac{38}{5} = 7,6$ 9) $(\frac{3}{8} - \frac{1}{20}) \cdot 10 = (\frac{15 - 2}{40}) \cdot 10 = \frac{13}{40} \cdot 10 = \frac{13}{4} = 3,25$ 10) $(\frac{2}{20} + \frac{7}{30}) \cdot 15 = (\frac{1}{10} + \frac{7}{30}) \cdot 15 = (\frac{3 + 7}{30}) \cdot 15 = \frac{10}{30} \cdot 15 = \frac{1}{3} \cdot 15 = 5$ 11) $(\frac{9}{10} - \frac{7}{15}) \cdot 3 = (\frac{27 - 14}{30}) \cdot 3 = \frac{13}{30} \cdot 3 = \frac{13}{10} = 1,3$ 12) $(\frac{1}{6} + \frac{1}{4}) \cdot 9 = (\frac{2 + 3}{12}) \cdot 9 = \frac{5}{12} \cdot 9 = \frac{5 \cdot 3}{4} = \frac{15}{4} = 3,75$ ### Задание 2. Найдите значение выражения 1) $(\frac{9}{16} + 2\frac{3}{8}) \cdot 4 = (\frac{9}{16} + \frac{19}{8}) \cdot 4 = (\frac{9 + 38}{16}) \cdot 4 = \frac{47}{16} \cdot 4 = \frac{47}{4} = 11,75$ 2) $(\frac{4}{9} - 3\frac{1}{15}) \cdot 9 = \frac{4}{9} \cdot 9 - \frac{46}{15} \cdot 9 = 4 - \frac{46 \cdot 3}{5} = 4 - \frac{138}{5} = 4 - 27,6 = -23,6$ 3) $(2\frac{3}{4} + 2\frac{1}{5}) \cdot 16 = (\frac{11}{4} + \frac{11}{5}) \cdot 16 = \frac{55 + 44}{20} \cdot 16 = \frac{99}{20} \cdot 16 = \frac{99 \cdot 4}{5} = \frac{396}{5} = 79,2$