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a) &nbsp; Liczby&nbsp; a &nbsp;i&nbsp; b &nbsp;są dodatnie, więc jeżeli kwadraty tych liczb są równe, to liczby te są równe. Sprawdzamy, czy zachodzi podany warunek:&nbsp;

a) &nbsp; Wyrażenia po obu stronach równości są liczbami dodatnimi, więc jeżeli kwadraty tych wyrażeń są równe, to liczby te również są równe. (2−3<svg xmlns="http://www.w3.org/2000/svg" width='400em' height='1.08em' viewBox='0 0 400000 1080' preserveAspectRatio='xMinYMin slice'><path d='M95,702
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