Question

Помогите ришить 3 и 4 срочно!!!!

Answer 1

Ответ:

$a)\frac{5}{6}+ \frac{16}{15} +\frac{3}{20})*\frac{6}{5} +\frac{4}{5} =3\frac{13}{50} \\1)\frac{5}{6}+ \frac{16}{15}=\frac{5*5}{6*5}+ \frac{16*2}{15*2}=\frac{25}{30}+ \frac{32}{30}=\frac{57}{30} \\\\2)\frac{57}{30}+ \frac{3}{20}= \frac{57*2}{30*2}+ \frac{3*3}{20*3}= \frac{114}{60}+ \frac{9}{60}=\frac{123}{60}\\\\3)\frac{123}{60}* \frac{6}{5}=\frac{123*\not6}{\not60*5}=\frac{123}{50} \\\\4)\frac{123}{50}+\frac{4}{5}= \frac{123}{50}+\frac{4*10}{5*10}=\frac{123+40}{50}=\frac{163}{50}$

$b)\dfrac{\frac{7}{9} :2+\frac{7}{10} }{\frac{28}{5}:\frac{1}{4} } =\frac{7}{144} \\\\1)\frac{7}{9} :2+\frac{7}{10}=\frac{7*5}{18*5}+\frac{7*9}{10*9} =\frac{35}{90} +\frac{63}{90} =\frac{98}{90} \\\\2)\frac{28}{5} :\frac{1}{4}=\frac{28}{5}* \frac{4}{1} =\frac{28*4}{5}=\frac{112}{5} \\\\3)\dfrac{\frac{98}{90} }{\frac{112}{5} } =\dfrac{98*5}{90*112}=\frac{7}{144}$

Пошаговое объяснение: