выполните сложение -6+4 5/8
-2/9+5/6
2 21/26+(-3 4/13)

-6+4 5/8=-1 3/8
-2/9 +5/6=-8/36+30/36=22/36=11/18
2 21/26+(-3 4/13)=73/26-43/13=73/26-86/26=-13/26=-1/2