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Verified answer
Bab Rasionalisasi PenyebutMatematika SMP Kelas IX
21/(2 √3 + √5) = (21/(2√3 + √5)) x ((2√3 - √5)/(2√3 - √5))
= (21 (2√3 - √5)) / ((2√3)² - √5²)
= (21 (2√3 - √5)) / (12 - 5)
= (21 (2√3 - √5)) / 7
= 3 (2√3 - √5)
= 6√3 - 3√5
ini dia jawaban saya semoga bermanfaat