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422 × 646 ÷ 640 = 4? × 361). 232). 243). 254). 12 |
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Answer» 422 × 646 ÷ 640 = 4? × 36 (am )N = amn ⇒ 422 × 246 × 346 ÷ 640 = 4? × 36 ⇒ 422 × 26 × 36 × 640 ÷ 640 = 4? × 36 By using the law of indices, am ÷ an = a{m – n} ⇒ 422 × (22)3 × 36 – 6 × 640 – 40 = 4? ⇒ 422 × 43 = 4? By using the law of indices, am × an = a{m + n} ⇒ 422 + 3 = 4? ⇒ 425 = 4? ∴ ? = 25 |
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