Úloha ID 1748 - 
Pro který z následujících matematických výrazů může platit, že x = 5?
Správná odpověď je: A
Ve jmenovateli zlomku nikdy nesmí být nula. Aby tedy x mohlo být rovno pěti, tak ve jmenovateli nesmí být x – 5. Odpověď A lze upravit jako (x – 5)2/(x – 5)(x + 5), tedy (x – 5)/(x + 5). Zbavíme se tak nuly ve jmenovateli a výraz pro x = 5 by byl vyčíslitelný (roven nule).
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