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Rezolvati ecuatiile :

(13:X-1) x 13=0

(5X-7):3=11

11-(1+x)=9

Răspuns :

Nyx
[tex]( \frac{13}{x} -1) * 13=0. aducem .la .acelasi .numitor. paranteza.<=>( \frac{13-x}{x} )*13[/tex]=0=>[tex] \frac{169-13x}{x}=0[/tex] => 169-13 x=0 ->- 13x=-169 => x=13
                       
5x-7 = 11 => 5x-7=33 => 5x=40 => x=8
  3

11- (1+x)=9
11-1-x=9
10-x=9
-x=-1
x=1

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