December 2018 2 49 Report
Podaj dziedzinę wyrażenia, a następnie uprość:
a)  \frac{x + 1}{x - 1} - \frac{1 - x}{x + 1}
b)  \frac{x + 1}{x - 1} * \frac{1 - x}{x + 1}
c)  \frac{2}{5 + x} * ( x^{2} - 25 )
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