已知图形
的相邻两边垂直,
.当动点M以
的速度沿图①的边框按
的路径运动时,
的面积S随时间t的变化如图②所示.回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/47602f7e-e20e-4c80-926c-d99b4478d1c5.png?resizew=413)
(1)图②中的自变量是 ,因变量是 ;
(2)题目中的a是 ,
的长度是 ;
(3)当t为何值时,
的面积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee49e97546d466ba3ee630e08cdc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1950e3224931a713a10c9c32740ddd2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/17/47602f7e-e20e-4c80-926c-d99b4478d1c5.png?resizew=413)
(1)图②中的自变量是 ,因变量是 ;
(2)题目中的a是 ,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f841addb968d2bd860226f5e52f7b963.png)
更新时间:2023-04-14 20:55:47
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】如图为一个拱桥横截面的示意图,跨度
为4米.在距点
水平距离为
米的地点,拱桥距离水面的高度为
米.请你根据学习函数的经验,对
和
之间的关系进行探究.
下面是探究过程,请补充完整:
(1)经过测量,得出了
和
的几组对应值,如下表:
在
和
这两个变量中,_______是自变量,_______是这个变量的函数;
(2)在平面直角坐标系
中,画出(1)中所确定的函数的图象;
(3)结合表格数据和函数图象,解决问题:
①桥墩露出水面的高度
为_______米;
②公园欲开设游船项目,现有长为
米,宽为
米,露出水面高度为
米的游船.为安全起见,公园要在水面上的
,
两处设置警戒线,并且
,要求游船能从
,
两点之间安全通过,则
处距桥墩的距离
至少为_______米.(精确到
米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/39fee211-9d83-4168-b020-f88584d8d516.png?resizew=450)
下面是探究过程,请补充完整:
(1)经过测量,得出了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
| ||||||||
|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
(2)在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(3)结合表格数据和函数图象,解决问题:
①桥墩露出水面的高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②公园欲开设游船项目,现有长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32605e4542751fbed47c0baa2a9a0525.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf857e03d4320c999d328fd657c2d412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2466cd4f7db939faf82172df7040b16a.png)
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【推荐2】指出下列关系式中的变量和常量.
(1)球的表面积
与球的半径
的关系式为
.
(2)一物体自高处自由落下,这个物体运动的距离
与它下落的时间
的关系式为
(其中
).
(1)球的表面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9091bc1886a3fd3d17160b2d41ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56992c399c4dbe23735f4e3740bcde5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db492b8c6e11afe336ee7d4a32e51a0.png)
(2)一物体自高处自由落下,这个物体运动的距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/584ebbc78a5b00e791ea25e3959a789f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81a08d9ebbd192a2bf960cd88169c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda07ceee54769c8f2b68b48237d9a7b.png)
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【推荐1】如图,在平面直角坐标系中,
的顶点
的坐标为
,顶点
在
轴的负半轴上,顶点
在
轴的正半轴上,且
,线段
的垂直平分线分别交
于点
.
![](https://img.xkw.com/dksih/QBM/2019/11/14/2333810486362112/2335022470184960/STEM/7299b1215e4d43e18ed0c2341aedc08b.png?resizew=193)
(1)点
的坐标;
(2)点
为线段
的延长线上的一点,连接
,设点
的横坐标为
,
的面积为
,求
与
的函数关系式;
(3)在(2)的条件下,点
为线段
的延长线上一点,连接
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed66b3c9991eb34c3ca9e4382e7ebf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c68f85ffce0c6b302ce914767e778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403f74eab33359ba256d0076a6d14f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://img.xkw.com/dksih/QBM/2019/11/14/2333810486362112/2335022470184960/STEM/7299b1215e4d43e18ed0c2341aedc08b.png?resizew=193)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61de6d673ecbbbd9458991558e7dc90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b280088a8f97b52c2145bc709434e7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82025027439a97a865dc7532825cc841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf2758978352acac95eae24d3f93375.png)
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解答题-作图题
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适中
(0.65)
【推荐2】探索题:
(1)在如图1的格点图中,各个多边形的内部都有而且只有1个点.(相邻两格点的距离为1)
![](https://img.xkw.com/dksih/QBM/2019/12/6/2349327913492480/2349512425447424/STEM/2168166a47f84977b648ceb1258811b0.png?resizew=388)
将各个多边形的面积与它四周各边上点的个数填入下表,你能发现什么规律?
请写出
与
之间的关系式;
(2)在如图2的单元格中,画出几个多边形,使其内部都有而且只有2个点,再按第1题的做法,你发现此时各个多边形的面积与四周各边上的点的个数之间又有什么样的关系呢?请写出
与
之之间的表达
![](https://img.xkw.com/dksih/QBM/2019/12/6/2349327913492480/2349512425447424/STEM/ffa54673daf44d6f8164074b737490dd.png?resizew=297)
(3)请你继续探索,当格点多边形内部有而且只有
个格点时,猜想
与
有怎么样的关系.
(1)在如图1的格点图中,各个多边形的内部都有而且只有1个点.(相邻两格点的距离为1)
![](https://img.xkw.com/dksih/QBM/2019/12/6/2349327913492480/2349512425447424/STEM/2168166a47f84977b648ceb1258811b0.png?resizew=388)
将各个多边形的面积与它四周各边上点的个数填入下表,你能发现什么规律?
多边形序号 | 1 | 2 | 3 | … |
多边形面积![]() | … | |||
多边形各边上点 的个数 ![]() | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在如图2的单元格中,画出几个多边形,使其内部都有而且只有2个点,再按第1题的做法,你发现此时各个多边形的面积与四周各边上的点的个数之间又有什么样的关系呢?请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2019/12/6/2349327913492480/2349512425447424/STEM/ffa54673daf44d6f8164074b737490dd.png?resizew=297)
(3)请你继续探索,当格点多边形内部有而且只有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐1】“夏至”是二十四节气的第十个节气,《烙遵宪度》中解释道:“日北至,日长之至,日影短至,故曰夏至,至者,极也.”夏至入节的时间为每年公历的6月21日或6月22日.
某小组通过学习、查找文献,得到了夏至日正午中午12时,在北半球不同纬度的地方,
高的物体的影长和纬度的相关数据,记纬度为x(单位:度),影长为y(单位:
),x与y的部分数据如下表:
(1)通过分析上表数据,发现可以用函数刻画纬度x和影长y之间的关系,在平面直角坐标系
中,画出此函数的图象;
高的物体的影长约为______
(精确到
);
(3)小红与小明是好朋友,他们生活在北半球不同纬度的地区,在夏至日正午,他们测量了
高的物体的影长均为
,那么他们生活的地区纬度差约是______度.
某小组通过学习、查找文献,得到了夏至日正午中午12时,在北半球不同纬度的地方,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd40392d92b8b98669f3a6be2869dd62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405554b6a34430029b4bab739d69bca3.png)
x | 0 | 5 | 15 | ![]() | 25 | 35 | 45 | 55 | 65 |
y | ![]() | ![]() | ![]() | 0 | ![]() | ![]() | ![]() | ![]() | ![]() |
(1)通过分析上表数据,发现可以用函数刻画纬度x和影长y之间的关系,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd40392d92b8b98669f3a6be2869dd62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405554b6a34430029b4bab739d69bca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
(3)小红与小明是好朋友,他们生活在北半球不同纬度的地区,在夏至日正午,他们测量了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd40392d92b8b98669f3a6be2869dd62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19319f16d4712d3c6177b58ceead007.png)
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解答题-作图题
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【推荐2】某校甲、乙两位老师住同一小区,该小区距离学校
,甲从小区步行去学校,出发
后,乙从小区先骑共享单车与甲同路,途经学校,又骑行一段路程后到还车点,之后立即步行回学校.已知甲步行速度比乙步行速度快
,设甲步行的时间为
.图1中线段
和折线
分别表示甲、乙离开小区的路程
与
的关系图象;
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897107862888448/2960145623384064/STEM/d6b69f26-5455-48a1-9973-7f323bf9e35b.png?resizew=416)
(1)求甲步行的速度和乙出发时甲离开小区的路程.
(2)求乙骑共享单车的速度和乙到达还车点时两人的距离.
(3)在图2中画出表示甲、乙两人之间距离
与
的关系图象.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8845c85e0989f2d783da69c7c9cfeeb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb21c93732b200bdddc5217b66090722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0612aa1e5001a3a5536ebb68033b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b36253f39741a2d99f9349d0ecf43dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5d53e570a2f8516c7af8b22662c195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f38197c34c42e180eac825662efd62d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b36253f39741a2d99f9349d0ecf43dc.png)
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897107862888448/2960145623384064/STEM/d6b69f26-5455-48a1-9973-7f323bf9e35b.png?resizew=416)
(1)求甲步行的速度和乙出发时甲离开小区的路程.
(2)求乙骑共享单车的速度和乙到达还车点时两人的距离.
(3)在图2中画出表示甲、乙两人之间距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dd602a7c31f2c2f5786031980776db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b36253f39741a2d99f9349d0ecf43dc.png)
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|
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(0.65)
【推荐1】某星期天早晨,小华从家出发步行前往体育馆锻炼,途中在报亭看了一会儿报,如图所示是小华从家到体育馆这一过程中所走的路程
米
与时间
分
之间的关系.
体育馆离小华家_______米,从出发到体育馆,小华共用了______分钟;
小华在报亭看报用了多少分钟?
小华看完报后到体育馆的平均速度是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1878c4a926059922121f6ae9b6d6a15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee1a9b57653b5a3ee92f7d9550deb1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://img.xkw.com/dksih/QBM/2019/10/14/2311693275922432/2317313557864448/STEM/4cb1f09e624d410580ff9043b8bcb0f8.png?resizew=255)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】如图1,已知直线
,点
,
在直线
上,点
,
在直线
上,且AB//CD,若
保持不动,线段
先向右匀速平行移动,中间停止一段时间后再向左匀速平行移动.图2反映了
的长度
随时间
的变化而变化的情况,则
(1)在线段
开始平移之前,
_______
;
(2)线段
边向右平移了_______
,向右平移的速度是______
;
(3)图3反映了变化过程中
的面积
随时间
变化的情况.
①平行线
,
之间的距离为_______
;
②当
时,面积S的值为_____
;
③当
时,直接写出
关于
的函数关系式______(可以不化简).
![](https://img.xkw.com/dksih/QBM/2020/5/8/2458337032069120/2458448110690304/STEM/0ec6e991e6f04b2c82ca069491732274.png?resizew=206)
![](https://img.xkw.com/dksih/QBM/2020/5/8/2458337032069120/2458448110690304/STEM/f78bbed1af154d41926406614416a6b9.png?resizew=245)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80645381feb9746cc149da61d553974a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab39610f90249f6bbc5e41942786898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
(1)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dba1d72ab2c7823a90238b16e032a0.png)
(3)图3反映了变化过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81093ecb78b4ee7ed9dd140a25996d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
①平行线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10151385d21c8173c07e9d5cb23776d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67883bccfc7cc4a43cd9e64f88a1999f.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81c2182ce28e5c62e63631466230fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cd93a45123a06e6c292efdcea1b6bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
![](https://img.xkw.com/dksih/QBM/2020/5/8/2458337032069120/2458448110690304/STEM/0ec6e991e6f04b2c82ca069491732274.png?resizew=206)
![](https://img.xkw.com/dksih/QBM/2020/5/8/2458337032069120/2458448110690304/STEM/f78bbed1af154d41926406614416a6b9.png?resizew=245)
![](https://img.xkw.com/dksih/QBM/2020/5/8/2458337032069120/2458448110690304/STEM/bea52a8b0d5a4eaea2bee0a8525ba310.png?resizew=306)
您最近一年使用:0次