Question

Найдите значение выражений 1)) 27+3 12)*4 23, 2) (4 15-2 34)*2 219, 3) (5 67+3 521)*2 110, 4) (7 512-3 16)*2 217, напишите пожалуйста

Answer 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)
$(7 frac{5}{12} - 3 frac{1}{6} ) * 2 frac{2}{17} = 9 \ \ 1)7 frac{5}{12} - 3 frac{1}{6}= 7 frac{10}{24} - 3 frac{4}{24} = 4 frac{6}{24} =4 frac{1}{4} \ \ 2) 4 frac{1}{4} *2 frac{2}{17} = frac{17}{4} * frac{36}{17} = frac{36}{4} = 9$