April 2019 0 87 Report
Niech b+d≠0, b≠0, d≠0. Udowodnij, że \frac{a}{b} + \frac{c}{d} = \frac{a+c}{b+d} wtedy i tylko wtedy, gdy \frac{a}{b^{2}} + \frac{c}{d^{2}} =0.
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