1 1/2+2,5=1 1/2+2 1/2=4
-1 7/15+(-3 5/8)=-1 56/120-3 75/120=
-5 11/120
-8/9+2 1/6=-16/18+2 3/18=1 5/18
1 11/35+(-1/23)=1 253/805-35/805=
1 218/805
1 1/2+2,5=1 1/2+2 1/2=4
-1 7/15+(-3 5/8)=-1 56/120-3 75/120=
-5 11/120
-8/9+2 1/6=-16/18+2 3/18=1 5/18
1 11/35+(-1/23)=1 253/805-35/805=
1 218/805