usuń niewymierność z mianownika:
2 √5+2 2(√5+2) 2(√5+2)
----- * -------= -----------= ----------=
√5-2 √5+2 (√5)²-2² 5-4
= 2(√5+2)
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2 √5+2 2(√5+2) 2(√5+2)
----- * -------= -----------= ----------=
√5-2 √5+2 (√5)²-2² 5-4
= 2(√5+2)