Răspuns:
6/8 +11/20=0,75+ 0,55= 1,3
........
Simplificam 6/8 cu 2 si avem 3/4.
Deci:
6/8+11/20=3/4+11/20=
(3×5+11)/20=(15+11)/20=
26/20=13/10=1.3