Hомер 591 .Помогите пожалуйста

1.
1) $\frac{-5}{12} - \frac{3}{4}= \frac{-5}{12}- \frac{9}{12}= \frac{-14}{12}$
2) $\frac{-14}{12}:2 \frac{1}{3}= \frac{-14}{12}: \frac{7}{3}= \frac{-14}{12}* \frac{3}{7}= \frac{-2}{4}= \frac{-1}{2}$
3) $5 \frac{1}{3}*0.75=5 \frac{1}{3}* \frac{3}{4}= \frac{16}{3}* \frac{3}{4}=4$
4)-0.5+4=3.5

2.
1)(-2.5- $1 \frac{5}{6} = \frac{-25}{10} - \frac{11}{6}= \frac{-75}{30}- \frac{55}{30}= \frac{-130}{30}= \frac{-13}{3}$
2) $\frac{-13}{3}:1 \frac{4}{9}= \frac{-13}{3}: \frac{13}{9}= \frac{-13}{3}* \frac{9}{13}=-3$
3) $3 \frac{5}{9}*-2 \frac{1}{4}= \frac{32}{9}*- \frac{9}{4}=-8$
-3--8=-3+8=5

3.
1) $-3.8+2 \frac{1}{3}= \frac{-38}{10}+ \frac{7}{3}= \frac{-114}{30}+ \frac{70}{30}= \frac{-44}{30}$
2) $\frac{-44}{30}*-1 \frac{7}{8}= \frac{-44}{30}*- \frac{15}{8}= \frac{11}{4}$
3) $4 \frac{1}{6}:-1 \frac{2}{3} = \frac{25}{6}: \frac{-5}{3}= \frac{25}{6}* \frac{-3}{5}= \frac{-5}{2}$
4) $\frac{11}{4}- \frac{5}{2}= \frac{11}{4}- \frac{10}{4}= \frac{1}{4}=0.25$