Usuń niewymierność z mianownika:
Mnozymy przez -3√5
Góra: (5-2√5)(-3√5)= -15√5+30
Dół (3√5)(-3√5)=-45
= (5-2√5)/ 3√5 *√5/√5 =
= (5√5 -2*5) /3*5 =
= (5√5 -10) /15 =
= 5(√5 -2)/15 =
= (√5 -2 ) /3
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Mnozymy przez -3√5
Góra: (5-2√5)(-3√5)= -15√5+30
Dół (3√5)(-3√5)=-45
= (5-2√5)/ 3√5 *√5/√5 =
= (5√5 -2*5) /3*5 =
= (5√5 -10) /15 =
= 5(√5 -2)/15 =
= (√5 -2 ) /3