2020高三·全国·专题练习
1 . 在一块顶角为
、腰长为
的等腰三角形厚钢板废料
中,用电焊切割成扇形,现有如图所示两种方案,既要充分利用废料,又要切割时间最短,问哪一种方案最优?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/6905c365-29fe-4f36-ae52-75004d0034fb.png?resizew=296)
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21-22高一·全国·课后作业
2 . 给出几种变换:
①横坐标伸长到原来的2倍,纵坐标不变;
②横坐标缩小到原来的
,纵坐标不变;
③向左平移
个单位长度;
④向右平移
个单位长度;
⑤向左平移
个单位长度;
⑥向右平移
个单位长度;
则由函数
的图象得到
的图象,可以实施的方案是( )
①横坐标伸长到原来的2倍,纵坐标不变;
②横坐标缩小到原来的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
③向左平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
④向右平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
⑤向左平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
⑥向右平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
则由函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b9643da0c0fea4f099f9a9133d6076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/912d0b85c5c73d87d87b0c1bb0fb2888.png)
A.①→③ | B.②→③ |
C.②→④ | D.②→⑤ |
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3 . 如图所示,用两种方案将一块顶角为
,腰长为2的等腰三角形钢板OAB裁剪成扇形,若方案一、二扇形的面积分别为
,
,周长分别为
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
_________
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
_________
(用“<,=,>”填空)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625242144669696/2626006800564224/STEM/9fc8fcb6-40b7-4727-8723-a5de58d32983.png?resizew=590)
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4 . 已知函数
.
(1)求
的单调递减区间;
(2)经过怎样的图象变换可使
的图象关于y轴对称?(仅叙述一种方案即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf92c30858b7d9cd0ad08c08f7c413c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)经过怎样的图象变换可使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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11-12高一上·黑龙江牡丹江·期末
5 . 如图,一块半径为
,圆心角为
的扇形木板
,现要用其截出一块面积最大的矩形木板,下面提供了两种截出方案,试比较两种方案截出的最大矩形面积哪个最大?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdab625e32e38d1c72c901cece0e147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6c71a0da6a878a5b12bf8a8e784645.png)
![](https://img.xkw.com/dksih/QBM/2016/11/28/1573185319272448/1573185325457408/STEM/e2e50cd5dcd847b2938ae2ea3c07455d.png)
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