3,5-4,8+(-21,7)-(-13,5)=
0,3036:(-0,23)=
5,5* 1 1/11:(13 1/7-9 1/2)=
1)-9.5
2)-1.32
3)-0.20533
1.-1.8+(-21.7)-(-13.5)= 10
2.-1.32
3.4
---
14