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1. ³√ 140.608 = 52
= ³√ 21.952 = 28
= ³√ 64×216 = ³√ 13.824 = 24
=> 52 - 28 + 24 = 48 ( D)
2. 40² - 12² + 8²
= 40² = 1.600
= 12² = 144
= 8² = 64
=> 1.600 - 144 + 64
= 1.520 (C)
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