(x+1/x)^n展开式的二项系数之和为64,则展开式的常数项是?
人气:346 ℃ 时间:2020-02-03 00:02:57
解答
(x+1/x)^n=(x+1)^n/x^n
分子展开后可得x^n+ax^(n-1)+bx^(n-2)……+1,所以常数项恒为1
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