Question

Помогите срочнооооо!!!
Дам 15 баллов​

Answer 1

Ответ:

$(\frac{2}{7} +3\frac{1}{2})*4\frac{2}{3} =(\frac{2}{7} +\frac{7}{2})*4\frac{2}{3}=(\frac{4}{14} +\frac{49}{14})*4\frac{2}{3}=\frac{53}{14}*\frac{14}{3}=\frac{53}{3}=17\frac{2}{3}$

$(4\frac{1}{5} -2\frac{3}{4})* 2\frac{2}{19} =(\frac{21}{5} -\frac{11}{4})* \frac{40}{19} =(\frac{84}{20} -\frac{55}{20})* \frac{40}{19} =\frac{29}{20}* \frac{40}{19} =\frac{58}{19}=3\frac{1}{19}$

$(5\frac{6}{7} +3\frac{5}{21} )*2\frac{1}{10} =(\frac{41}{7} +\frac{68}{21} )*\frac{21}{10} =(\frac{123}{21} +\frac{68}{21} )*\frac{21}{10} =\frac{191}{21} *\frac{21}{10} =\frac{191}{10} =19\frac{1}{10}$

$(7\frac{5}{12} -3\frac{1}{6} )*2\frac{2}{7} =(\frac{89}{12} -\frac{19}{6} )*\frac{16}{7} =(\frac{89}{12} -\frac{38}{12} )*\frac{16}{7} =\frac{51}{12} *\frac{16}{7} =\frac{204}{21} =9\frac{15}{21} =9\frac{5}{7}$