December 2018 2 50 Report
Wyrażenie  \frac{1}{x-3} - \frac{1}{x+3} można zapisać w postaci

a)  \frac{x+3}{x-3}

b) 0

c) \frac{6}{ x^{2} - 9}

d) \frac{-1}{ x^{2} - 9}
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