题目
a的5次方-a,
提问时间：2020-10-28
答案
原式=a9a⁴-1)
=a(a²+1)(a²-1)
=a(a²+1)(a+1)(a-1)
=a(a²+1)(a²-1)
=a(a²+1)(a+1)(a-1)
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