suma celor 2numere naturale a caror suma este 28,iar unul este egal cu 2/5 din celălalt
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a=b:5x2
b |--|--|--|--|--| total 28
a |--|--|
28:7=4(a:2 sau b:5)
5x4=20(b)
2x4=8 (a)
a = 2/5 din b
....................
a |—|—|—|—|—|
b |—|—|
Acolada 28
28 : 7 = 4 ( un segment )
4 x 2 = 8 ( b )
4 x 5 = 20 ( a )
...........
v e r i f i c a r e : 20 + 8 = 28