Найдите значение выражений 1)) 2\7+3 1\2)*4 2\3, 2) (4 1\5-2 3\4)*2 2\19, 3) (5 6\7+3 5\21)*2

Ответы 1

1) $( \frac{2}{7} + 3 \frac{1}{2}) * 4 \frac{2}{3} = 17 \frac{2}{3} \\ \\ 1) \frac{2}{7} + 3 \frac{1}{2} = \frac{4}{14} +3 \frac{7}{14} = 3 + \frac{4+7}{14}= 3 \frac{11}{14} \\ \\ 2) 3 \frac{11}{14} * 4 \frac{2}{3} = \frac{3*14 + 11}{14} * \frac{4*3+2}{3} = \frac{53*14}{14*3} = \frac{53}{3} = 17 \frac{2}{3} \\ \\$ 2) $(4 \frac{1}{5} - 2 \frac{3}{4} )* 2 \frac{2}{19} = 3 \frac{1}{19} \\ \\ 1)4 \frac{1}{5} - 2 \frac{3}{4}= 4 \frac{4}{20} - 2 \frac{15}{20} = (3+ \frac{24}{20} ) - 2 \frac{15}{20} = (3-2) + \frac{24-15}{20} = 1 \frac{9}{20} \\ \\ 2) 1 \frac{9}{20} * 2 \frac{2}{19} = \frac{29}{20} * \frac{40}{19} = \frac{29*2}{1*19} = \frac{58}{19} = 3 \frac{1}{19}$ 3) $(5 \frac{6}{7} + 3 \frac{5}{21} ) * 2 \frac{1}{10} = 19 \frac{1}{10} \\ \\ 1)5 \frac{6}{7} + 3 \frac{5}{21} = 5 \frac{18}{21} + 3 \frac{5}{21} =(5+3) + \frac{18+5}{21} = 8 + 1 \frac{2}{21} =9 \frac{2}{21} \\ \\ 2) 9 \frac{2}{21} * 2 \frac{1}{10} = \frac{191}{21} * \frac{21}{10} = \frac{191}{10} =19 \frac{1}{10}$ 4) $(7 \frac{5}{12} - 3 \frac{1}{6} ) * 2 \frac{2}{17} = 9 \\ \\ 1)7 \frac{5}{12} - 3 \frac{1}{6}= 7 \frac{10}{24} - 3 \frac{4}{24} = 4 \frac{6}{24} =4 \frac{1}{4} \\ \\ 2) 4 \frac{1}{4} *2 \frac{2}{17} = \frac{17}{4} * \frac{36}{17} = \frac{36}{4} = 9$
- Автор:
  farmer61
- 5 лет назад
- 0
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