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假設兩個數為 a和b,他們的最大公約數是a/c, 那麼他們的最小公倍數為 (a/c) * a/(a/c) * b/(a/c) 化簡后得 b*c 所以 最大公約數 乘以 最小公倍數 = (a/c) * (b*c) =a*b 所以兩個數的乘積等於這兩個數的最大公約數與最小公倍數的乘積
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