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= 2^(12-6-2)
= 2⁴
= 8
b) (2-³ × 2² × 4)
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2 × 2 × 4-¹
= 2² × 2² × 2²
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2³ × 2 × 2
= 2^6
--------
2^5
= 2¹
= 2