January 2019 1 170 Report
Wyznacz dziedzinę wyrażenia:
a)  \frac{(x+4)(x-2)}{(x-3)(x+7)}
b)  \frac{ x^{2} -2x+3}{9 x^{2} -4}
c)  \frac{ x^{3}+4x }{27 x^{3}+x }
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