Odpowiedź :
[tex]x + (1 - x(x - 1)) = x + (1 - {x}^{2} + x) = x + 1 - {x}^{2} + x = 2x + 1 - {x}^{2} = \boxed{ - {x}^{2} + 2x + 1}[/tex]
[tex]x + (1 - x(x - 1)) = x + (1 - {x}^{2} + x) = x + 1 - {x}^{2} + x = 2x + 1 - {x}^{2} = \boxed{ - {x}^{2} + 2x + 1}[/tex]