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Alexuta2003
a fost răspuns

Ma poate ajuta cineva cu niste exercitii la mate:
|x-[tex] \frac{2}{3}
[/tex]|=[tex] \frac{1}{3}
[/tex]
|x+[tex] \frac{2}{3}
[/tex]|= -[tex] \frac{1}{3}
[/tex]

Răspuns :

Mikkka
|x -2/3| = 1/3⇒ x-2/3 = 1/3⇒ x=1/3+2/3⇒ x= 3/3⇒ x=1
               sau  x-2/3 = -1/3⇒x=-1/3+2/3⇒ x= 1/3 ⇒ x∈ {1/3 ; 1}

|x+2/3|  = -1/3, dar -1/3 < 0 , iar |x+2/3| ≥ 0 ⇒ x∈∅

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