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2014-05-17T17:14:20+03:00
1,2*X>=4
X>=4/1,2
x>=40/12
X>=10/3
x apartine [10/3;infinit) 
2 5 2
2014-05-17T17:15:16+03:00
1,2 *x ≥4  1,2= 1intreg  2/10= 1 intreg 1/5=  6/5
x ≥ 4/6/5
x ≥4 * 5/6
x  ≥10/3  ⇒x∈[10/3, α)