Odpowiedź:
[tex]a) \: {x}^{2} + 5x - 5x - 25 = {x}^{2} - 100x \\ 100x = 25 \\ x = \frac{1}{4} [/tex]
[tex]b) \: 9 - 6x + {x}^{2} - {x}^{2} - \frac{2}{3} x - \frac{1}{9} = \frac{2}{9 } \\ - 6 \frac{2}{3} x = - 8 \frac{6}{9} \\ - \frac{20}{3} x = - \frac{26}{3} \\ obie \: strony \: razy \: - \frac{3}{20} \\ x = 1 \frac{3}{10} [/tex]
[tex]c) \: 4( \frac{1}{4} {x}^{2} - 3x + 9) = 36 - 12x + {x}^{2} \\ {x}^{2} - 12x + 36 = 36 - 12x + {x}^{2} \\ 0 = 0[/tex]
