试题与答案

给出以下几个命题:①1是112和23的比例中项;②反比例函数y=1x的自变量x的

题型:选择题

题目:

给出以下几个命题:
①1是1
1
2
2
3
的比例中项;
②反比例函数y=
1
x
的自变量x的取值范围是任何实数;
③抛物线y=(2x+1)2的对称轴是直线x=-1;
④点P是线段AB的黄金分割点,则AP与AB的近似比是0.618.其中正确的命题有(  )
A.1个B.2个C.3个D.4个

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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