Răspuns:
Explicație pas cu pas:
a)
(1/2 + 3/4 + 5/6) + (1/2 + 1/4 + 1/6)
= 1/2 + 3/4 + 4/6 + 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
