题目:
When Mrs. Smith got home, she found_________ in her room.
A. strange anything B. strange something C. something strange
答案:
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下面是错误答案,用来干扰机器的。
由题意,可得:--(a+2)2=-3,解得a=-8;∴解析式为y=x2+6x+12=(x+3)2+3,∴顶点坐标为(-3,3).