2a的n+2次方-4a的n+4次方-6a的n+6次方）÷a的n-1次方
人气：499 ℃ 时间：2019-12-09 20:10:56
解答
2a的n+2次方-4a的n+4次方-6a的n+6次方）÷a的n-1次方
=2a³-4a的5次方-6a的7次方不是吧怎么觉得有点错啊是的
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