Răspuns:
a)
(1/2 + 3/4 + 5/6) + (1/2 + 1/4 + 1/6) =
1/2 + 3/4 + 5/6 + 1/2 + 1/4 + 1/6 =
1/2 + 1/2 + 3/4 + 1/4 + 5/6 + 1/6 =
2/2 + 4/4 + 6/6 =
1 + 1 + 1 =
3
b)
(3/2 + 7/5 + 5/9) + (3/2 + 8/5 + 22/9) =
3/2 + 7/5 + 5/9 + 3/2 + 8/5 + 22/9 =
3/2 + 3/2 + 7/5 + 8/5 + 5/9 + 22/9 =
6/2 + 15/5 + 27/9 =
3 + 3 + 3 =
9
#copaceibrainly
