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Verified answer
Bab Bilangan IrrasionalMatematika SMP Kelas IX
√(128 / (20 . 4)) = √(2 x 64 / (4 x 4 x 5))
= √(2 x 8² / (4² x 5))
= (8/4) (√2) / √5
= ((2√2)/√5) x (√5)/(√5)
= (2√10) / √5²
= (2/5) √10