December 2018 1 11 Report
Nie można skrócić wyrażenia:

A.  \frac{ x^{2} - 1}{x + 1}
B.  \frac{x - 1}{ x^{2} -1}
C.  \frac{ x^{2} -x}{ x^{2} - 1}
D.  \frac{ x^{2} +x}{ x^{2} + 1}

i dlaczego ??
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