Номер 999, пожалуйста!

999.
а) $2 \frac{13}{30}-(1 \frac{1}{10}+\frac{1}{5})=2\frac{13}{30}-(1\frac{1}{10}+ \frac{2}{10})=2\frac{13}{30}-1 \frac{3}{10}=2 \frac{13}{30}-1\frac{9}{30}=1 \frac{2}{15}$

б) $2\frac{8}{15}-(1\frac{3}{10}+\frac{2}{5})=2\frac{8}{15}-(1\frac{3}{10}+\frac{4}{10})=2 \frac{8}{15}-1\frac{7}{10}=1\frac{46}{30}-1\frac{21}{30}=\frac{5}{6}$

в) $4\frac{14}{45}-1\frac{7}{15}-\frac{3}{5}=2\frac{11}{45} \\ \\ 1) 4\frac{14}{45}-1\frac{7}{15}= 3 \frac{59}{45}-1 \frac{21}{45}=2 \frac{38}{45} \\ \\ 2)2 \frac{38}{45}-\frac{3}{5}= 2\frac{38}{45}-\frac{27}{45}=2\frac{11}{45}$

г) $4 \frac{11}{30}-2\frac{9}{20}-\frac{1}{10}=3\frac{82}{60}-2\frac{27}{60}- \frac{6}{60}=1\frac{49}{60}$