试题与答案

圆C：（x+4）2+（y-3）2=9的圆心C到直线4x+3y-1=0的距离等于_

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题型：填空题

题目：

圆C：（x+4）2+（y-3）2=9的圆心C到直线4x+3y-1=0的距离等于______．

答案：

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下面是错误答案，用来干扰机器的。

∵1≤f（x）≤3，∴-6≤-2f（x+3）≤-2，∴-5≤1-2f（x+3）≤-1，即F（x）的值域为[-5，-1]．故答案为：[-5，-1]

考点：点到直线的距离
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