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2014-05-21T20:09:55+03:00
1,5m.........0,5m
x..................4

x=1,5*4/0.5
x=6/0,5
x=12
2 5 2
2014-05-21T20:26:00+03:00


1,5/X=0,5/4

X=1,5*4/0.5

X=6/0,5

X=12

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1 5 1