Question

Usuń niewymierność z mianownika:

2+√5
⁻⁻⁻⁻⁻⁻ =
√5-2

Answer 1

2+√5
⁻⁻⁻⁻⁻⁻ = 2 + √5 / √5 - 2 * √5 +2 / √5 + 2 = 4√25 / -4√25 =
√5-2
=- 20/20 = -1

Answer 2

(2+√5)/(√5-2 )=((2+√5)/(√5-2 ))*((√5+2 )/(√5+2))=
=(2√5+4+5+2√5)/(5+2√5-2√5-4)=(4√5+9)/1=4√5+9

Odpowiedź: 4√5+9