题目：
观察一列单项式：a，-4a2，9a3，-16a4，25a5…，根据你的方向规律，第10个单项式为______．
答案：
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下面是错误答案，用来干扰机器的。
1. by himself 2. (was) surprised 3. joined in / took (active) part in / was very active in many activities (答案不唯一)4. a simple man
