Răspunsuri

2014-05-23T20:41:01+03:00
2x+1 |2x-1
2x+1|2x+1    ⇒2x+1|2x+1-2x+1   ⇒2x+1|2  ⇒2x+1 ∈{-1,1,-2,2}

2x+1=-1  2x=-2  x=-1
2x+1=1   2x=0   x=0
2x+1=-2  2x=-3   x= -3/2
2x+1=2   2x=1   x=1/2
3 3 3