一个圆柱的高等于底面半径,写出它的表面积S与底面半径r的函数关系式为_________ .
更新时间:2016-12-05 19:33:46
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【推荐1】如图,平面直角坐标系
中,
,
经过原点
和点
,若点
在抛物线
上,则点
的坐标为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
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【推荐2】如图,
和
是边长分别为5和2的等边三角形,点
、
、
、
都在直线
上,
固定不动,将
在直线
上自左向右平移.开始时,点
与点
重合,当点
移动到与点
重合时停止.设
移动的距离为
,两个三角形重叠部分的面积为
,请写出
与
之间的函数关系式_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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