Răspuns:
a)12/15 + 10/20 =
4/5 + 1/2 =
13/10
b)2/7 +8/14 =
2/7 + 4/7 =
6/7
c)8/15 • (15/16 • 8/3 • 3/4) =
8/15 • 15/8 =
1
d)9/10 : [(29/8 - 11/8) • 2/5] =
9/10 : (9/4 • 2/5) =
9/10 • 10/9 =
