1) Rezolvati ecuatiile in multimea numerelor naturale:
a) 2(2x+1)+3|2x+1|=4(x+3)+5
b) 3(2x+1)+4[tex] \sqrt{(2x-1) ^{2} } [/tex] =2(3x+4)+7
2) Rezolvati ecuatia [tex] (x-5)^{2} [/tex] - (x+3)(x+1)= [tex] (x+1)^{2} [/tex] - ([tex] x^{2} [/tex] +11) .
3) Rezolvati ecuatia: [tex] \frac{x+5}{4} + \frac{x+6}{5} + \frac{x+7}{6} + \frac{x+8}{7} + \frac{x+9}{8} = 5[/tex]