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2014-05-20T23:35:17+03:00
B-a=800
a/2=b/4⇒   4a=2b⇒a=2b/4=b/2
inlocuim
b-b/2=800
b/2=800⇒b=2·800=1600
a=b/2=1600/2=800
deci 1600-800=800