Question

Aduceti la acelasi numitor fractiile:


a)13/12, 5/9, 11/6, 7/18

b)3/7, 4/9, 11/14, 19/21

c)15/21, 48/98, 33/42, 34/84
                          
             Ajutor pana luni 









d)7/12, 23/28, 7/30, 6/40

e)19/10, 12/45, 14/20, 11/30

Answer 1

a) 12=2×2×3, 9=3×3,6=2×3,18=2×3×3
NC= 2×2×3×3=2×9=36
13×3/36,5×4/36,11×6/36,7×2/36
39/36,20/36,66/36,14/36
b) 7=7×1,9=3×3,14=2×7,21=3×7
NC= 2×3×3×7=6×21= 126
3×18/126,4×14/126,11×9/126,19×6/126
54/126,56/126,99/126,114/126
c) 21=3×7, 98=2×7×7,42=2×3×7,84=2×2×3×7
NC= 2×2×3×7×7=12×49=294×2=588
15×28/588,6×48/588,33×14/588,34×7/588
d) 12=2×2×3, 28=2×2×7,30=2×3×5,40=2×2×2×5
NC= 2×2×2×3×5×7=40×21=840
7×70/840 ,23×30/840,7×28/840,6×21/840
e) 10=2×5, 45=3×3×5,20=2×2×5,30=2×3×5
NC= 2×2×3×3×5=4×9×5=20×9=180
19×18/180,12×4/180,14×9/180,11×6/180