已知等腰三角形周长为20cm,若底边长为y(cm),一腰长为x(cm).
(1)写出y与
的函数关系式;
(2)求自变量
的取值范围.
(1)写出y与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求自变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2019-01-30 15:20:04
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【推荐1】某剧院的观众席的座位为扇形,且按下列方式设置:
(1)写出座位数
与排数
之间的关系式;
(2)按照上表所示的规律,某一排可能有90个座位吗?说说你的理由.
排数![]() | 1 | 2 | 3 | 4 | … |
座位数![]() | 50 | 53 | 56 | 59 | … |
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(2)按照上表所示的规律,某一排可能有90个座位吗?说说你的理由.
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在
中,
,
,
,两个动点P,Q同时从A点出发,点P沿
运动,点
沿
,
运动,两点同时到达点C.
(1)点Q的速度是点P速度的多少倍?
(2)设
,
的面积是y,求y关于x的函数关系式,并写出x的取值范围;
(3)求出y的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/cf10569a-d5b8-400d-b210-442489a64cc3.png?resizew=163)
(1)点Q的速度是点P速度的多少倍?
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
(3)求出y的最大值.
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适中
(0.65)
【推荐2】已知
的三边a,b,c满足
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(1)求c的取值范围;
(2)若
的周长为
,求c的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90ac1590d5a28d3423510aaa2a37f43.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
(1)求c的取值范围;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
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