1/4+7/2=( amplifici pe 7 cu 2)
1/4+14/4=15/4
3/21+1/7=(amplifici pe 1 cu 3)
3/21+3/21=6/21
5/81+1/9=(amplifici pe 1 cu 9)
5/81+9/81=14/81
10/33+4/3=(amplifici pe 4 cu 11)
10/33+44/33=54/33
21/20+3/5=(amplifici pe 3 cu 4)
21/20+12/20=33/20
Răspuns:
1/4+7/2 = 1/4 + 14/4 = 15/4 = 3 intregi si 3/4
3/21+ 1/7 = 3/21 +3/21 =6/21
5/81 +1/9 = 5/81 + 9/81= 14/81
10/33+4/3 = 10/33 + 44/33 = 54/33 = 1 intreg si 21/33
21/20+3/5 = 21/20 + 12/20 = 33/20 = 1 intreg si 13/20
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