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100以內:能被2整除的數有50個 能被3整除的數有33個 能被5整除的數有20個 而要記這三個數的倍數的總個數就要除去除去重複的數 2和3的最小公倍數是6所以凡6的倍數的數就要少算一次 100÷6≈16 2和5的最小公倍數是10 100÷10=10 3和5的最小公倍數是15 100÷15≈6 50+33+20-16-10-6+3=74
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