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2014-10-13T23:21:57+03:00
-1≤x≤2⇒x∈[-1,2] deci A={-1,0,1,2]
0<x≤1,5⇒x∈(0,1,5] deci B={1; 1,1 ; 1,2 ;1,3 ;1,4 ;1,5 }
x≥4⇒x∈[4,+infinit) deci C={4,5,6,7,8,9,10....}

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