she sometimes has to go home late because of extra work in the restaurant （同义句转换）

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• she sometimes has to go home late because of extra work in the restaurant （同义句转换）
• she sometimes has to go home late because of extra work in the restaurant （同义句转换）she sometimes has to go home late（ ）she does some extra work in the restaurant
• 数列{an}满足：a1=2，an=an-1+2n-1（n≥2），则该数列的通项公式是 _ ．
• 已知数列{an}中,a1=5且an=2an-1+2n-1（n≥2且n∈N+）