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證明:n個(a+b)相乘,是從(a+b)中取一個字母a或b的積.所以(a+b)^n的展開式中每一項都是)a^k*b^(n-k)的形式.對於每一個a^k*b^(n-k),是由k個(a+b)選了a,(a的係數為n个中取k個的組合數(就是那個C右上角一個數,右...
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