题目内容：
下面的函数是反比例函数的是( ).
A．y=3x+1 B．y=x2+2x
C．
D．
参考答案：
答案解析：
单选题：下面的函数是反比例函数的是( ).
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B．y=x2+2x
C．
D．
B．y=x2+2x
C．
D．
的极大值还是极小值.
的极大值还是极小值.
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