a²-4-----------a²-4a+4 to jest kreska ułamkowa jakby co
a² - 4 (a - 2)(a +2) a + 2
--------------- = ------------------ = = -----------
a² -4a + 4 (a - 2)² a - 2
zał. a ≠ 2
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a² - 4 (a - 2)(a +2) a + 2
--------------- = ------------------ = = -----------
a² -4a + 4 (a - 2)² a - 2
zał. a ≠ 2