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12.Sa se rezolve in multimea numerelor reale inecuatia: (2x-1)(x+1)≤-x+11.


Răspuns :

2[tex] x^{2} [/tex] +2x-x-1[tex] \leq [/tex]-x+11
2[tex] x^{2} [/tex]+2x-x+x[tex] \leq [/tex]11+1
2[tex] x^{2} [/tex]+2x[tex] \leq [/tex]10