Question

Пожалуйста помогите, очень надо

Answer 1

$\displaystyle (- \frac{3}{7}- \frac{5}{14}- \frac{8}{12}): \frac{3}{14}+ \frac{1}{8}=-6 \frac{47}{72} \\ \\ \\1).. - \frac{3}{7}- \frac{5}{14}=- \frac{6}{14}- \frac{5}{14}=- \frac{11}{14} \\ \\ 2)..- \frac{11}{14}- \frac{8}{12}=- \frac{33}{42}- \frac{28}{42}=- \frac{61}{42} \\ \\ 3)..- \frac{61}{42}: \frac{3}{14}=- \frac{61}{42}* \frac{14}{3}=- \frac{61}{9} \\ \\ 4)..- \frac{61}{9}+ \frac{1}{8}= \frac{9-488}{72}= -\frac{479}{72}=-6 \frac{47}{72}$

Или так:

$\displaystyle (- \frac{3}{7}- \frac{5}{14}- \frac{8}{12}): \frac{3}{14}+ \frac{1}{8}=- \frac{3*14}{7*3}- \frac{5*14}{14*3}- \frac{8*14}{12*3}+ \frac{1}{8}= \\ \\ \\ =-2- \frac{5}{3}- \frac{28}{9}+ \frac{1}{8}=-2- \frac{120}{72}- \frac{224}{72}+ \frac{9}{72}=-2- \frac{335}{72}=-6 \frac{47}{72}$