Rezolvati-l urgeeeeeeenttttt.

a)
1 / 5 + 7 / 10 =
2 / 10 + 7 / 10 = 9 / 10
b)
3 / 11 + 7 / 22 =
6 / 22 + 7 / 22 = 13 / 22
a)
amplifici 1/5 cu 2
1/5+7/10=2/10+7/10=9/10
b)
amplifici 3/11 cu 2
3/11+7/22=6/22+7/22=13/22