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二項式展開公式怎麼理解?答:(a+b)ⁿ;=C(n,0)aⁿ;+C(n,1)aⁿ;ֿ;¹;b+C(n,2)aⁿ;ֿ;²;b²;+.+C(n,(n-k))[a^(n-k)]b^k++.+C(n,n)bⁿ;=aⁿ;+na 8319;ֿ;¹;b+[n(n-…
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