题目
关于X的二项式(2X-1/X)的四次方 展开式中的常数项是多少
提问时间：2020-07-13
答案
这题应用二项式原理就会变得很简单 通过观察只有当a项与b项次数相等时才会得到常数 只用计算(2x)^2乘以(~1/x)^2结果为4
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