Question

раскройте скобки и упростите выражение , помогите пожалуйста​

Answer 1

Ответ:

1. $\frac{9}{16}(\frac{4}{5}-y)-(-\frac{1}{20}-y)=\frac{9}{16}*\frac{4}{5}-\frac{9}{16}y+\frac{1}{20}+y=\frac{9}{20}-\frac{9}{16}y+\frac{1}{20}+y=\frac{7}{16}y+\frac{1}{2}$

2. $-\frac{8}{21}(\frac{7}{16}+y)-(\frac{1}{6}+y)=-\frac{8}{21}*\frac{7}{16}-\frac{8}{21}y-\frac{1}{6}-y=-\frac{1}{6}-\frac{8}{21}y-\frac{1}{6}-y=-1\frac{8}{21}y-\frac{1}{3}$

3. $\frac{7}{18}(\frac{27}{28}+x)+(\frac{1}{4}-x)=\frac{7}{18}*\frac{27}{28}+\frac{7}{18}x+\frac{1}{4}-x=\frac{3}{8}+\frac{7}{18}x+\frac{1}{4}-x=-\frac{11}{18}x+\frac{5}{8}$

4. $-\frac{9}{28}(\frac{35}{36}-x)-(x+\frac{5}{8})=-\frac{9}{28}*\frac{35}{36}+\frac{9}{28}x-x-\frac{5}{8}=-\frac{5}{16}+\frac{9}{28}x-x-\frac{5}{8}=-\frac{19}{28}x-\frac{15}{16}$

Пошаговое объяснение: