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2014-03-24T15:19:34+02:00
3,4 < 2X + 1 < 5,6   /:2
1,7 < X + 0.5 < 2.8   /-0.5
1.2 < X < 2.3
X ∈ {1.3,1.4,...,2.2}
mersiii
va rog ajutatima. 3ori paranteza x plus4 inchid paranteza egal 18,9.