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Nilai dari 2∜81 × 16⁻¹ × 20 = ...

Penyelesaian:
2∜81 × 16⁻¹ × 20 = 2(3⁴)¼ . 2⁻⁴ . 2² . 5
= 2¹⁻⁴+² . 3 . 5
= 2⁻¹. 3 . 5
= 15
= 7½