题目

What are the two speakers mainly talking about?A.What to do in Florida.B.When to visit New York.C.Where to spend their vacation. 答案:【答案】C【解析】【原文】此题为听力题,解析略。先化简,再求值:9-a2a2+6a+9÷a2-3aa+3+2a,其中a=2.
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