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11. 設 a、b 為整數,a = 3 × 52 × 73,且 ( a , b ) = 35,則 b 可以是下列哪一個數?(A) 65 (B) 70 (C) 105 (D) 175
問題詳情
11. 設 a、b 為整數,a = 3 × 52 × 73,且 ( a , b ) = 35,則 b 可以是下列哪一個數?
(A) 65
(B) 70
(C) 105
(D) 175
參考答案
答案:B
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10. 若 1 × 2 × 3 × ⋯ ⋯ × 30 = a,則 a 有多少個相異的質因數?(A) 8 個 (B) 9 個 (C) 10 個 (D) 11 個
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12. 下列選項中所表示的數,哪一個與 252 的最大公因數為 42?(A) 2 × 3 × 52 × 72(B) 2 × 32 × 5 × 72(C) 22 × 3 × 52 × 7 (D) 22
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