ПОМОГИТЕ ПОЖАЛУЙСТА! 1) (7/30+8/45)+(2/45+1/30)=? 2) (5/24+11/60)+(13/60+1/24)=?

Решите задачу:

$(\frac{7}{30}+\frac{8}{45})+(\frac{2}{45}+\frac{1}{30})=(\frac{7}{30}+\frac{1}{30})+(\frac{8}{45}+\frac{2}{45})=\\\frac{8}{30}+\frac{10}{45}=\frac{12}{45}+\frac{10}{45}=\frac{22}{45}\\ (\frac{5}{24}+\frac{11}{60})+(\frac{13}{60}+\frac{1}{24})=(\frac{5}{24}+\frac{1}{24})+(\frac{11}{60}+\frac{13}{60})=\frac{6}{24}+\frac{24}{60}=\frac{15}{60}+\frac{24}{60}=\\ \frac{13}{20}\\$