1. 3/2-√5 2. 2√5/√6-√8

Kelas 9 Matematika
Bab Akar dan Pangkat

1] 3/(2 - √5)
= (3/(2 - √5)) . (2 + √5)/(2 + √5)
= (6 + 3√5)/(2² - √5²)
= (6 + 3√5)/(4 - 5)
= (6 + 3√5)/(-1)
= -6 - 3√5

2] (2√5)/(√6 - √8)
= ((2√5)/(√6 - √8)) . (√6 + √8)/(√6 + √8)
= (2√30 + 2√40)/(√6² - √8²)
= (2√30 + 2√40)/(6 - 8)
= (2√30 + 2√40/(-2)
= -√30 - √40
= -√30 - 2√10