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Rezolvati ecuatia in multimea numerelor naturale:


2x + 1 supra 5 = x - 1 supra 2


Răspuns :

_2x+1_= _x- 1_
      5           2

2( 2x+1) = 5( x-1)

4x+2 = 5x- 5

5+2 = 5x- 4x

7 = x ∈ IN
[tex]\frac{2x+1}{5}=\frac{x-1}{2}\\ .\;\;\;\;\;\;\;\Downarrow\\ 4x+2\;=\;5x-5\\ +5+2=5x-4x\\ .\;\;\;\;\;\;\;\;\;x=7 [/tex]