如图,二次函数
与x轴交于A、B两点,与y轴交于点C,点D与点C关于x轴对称,点P从A点出发向点D运动,点Q在DB上,且∠PCQ=45°,则封闭图形DPCQ(阴影部分)面积的变化情况是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17faea138e0ea57e848f7e3d33683c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/88172156-05b2-4b25-9626-13fb7943cea9.png?resizew=196)
A.一直变大 | B.始终不变 | C.先增大后减少 | D.先减少后增大 |
更新时间:2020-04-06 10:26:39
|
相似题推荐
单选题
|
较难
(0.4)
【推荐1】如图,正方形ABCD的边长为2cm,在对称中心O处有一个钉子.动点P、Q同时从点A出发,点P沿A-B-C方向以每秒2cm的速度运动,到C点停止,点Q沿A-D方向以每秒1cm的速度运动,到D点停止.PQ两点用一条可伸缩的细橡皮筋连接,当遇到钉子后,橡皮筋会自动弯折.如果x秒后橡皮筋扫过的面积为ycm2,那么y与x的函数关系图象可能是( )
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748021501952/1573748027277312/STEM/bd3fe1899908479aa1e340b581ec912f.png)
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748021501952/1573748027277312/STEM/bd3fe1899908479aa1e340b581ec912f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
【推荐2】如图1,在矩形
中,动点
从点
出发,沿
方向运动,当点
到达点
时停止运动,过点
作
交
于点
,设点
的运动路程为
,图2表示的是
与
的函数关系的大致图象,则函数图象中
的值为( )
![](https://img.xkw.com/dksih/QBM/2020/7/21/2510565696339968/2510897542815744/STEM/dca2ea8f4cff41bdb8fee23dd1a52e8f.png?resizew=497)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5580a6c7f3cbeda5f670eecf67ef670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe2f604091e9667da0974976a5b7ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0807e6612cc1c0b31ff3503373b83f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2020/7/21/2510565696339968/2510897542815744/STEM/dca2ea8f4cff41bdb8fee23dd1a52e8f.png?resizew=497)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
【推荐1】在平面直角坐标系中,正方形ABCD的位置如图所示,点A的坐标为(1,0),点D的坐标为(0,2).延长CB交x轴于点A1,作正方形A1B1C1C;延长C1B1交x轴于点A2,作正方形A2B2C2C1…按这样的规律进行下去,第2012个正方形的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/3955c271-6bf4-48b5-bae0-64ac2b1143bb.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/3955c271-6bf4-48b5-bae0-64ac2b1143bb.png?resizew=193)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
较难
(0.4)
名校
【推荐2】如图,在△ABC中,∠ACB=90°,以△ABC的各边为边分别作正方形BAHI,正方形BCFG与正方形CADE,延长BG,FG分别交AD,DE于点K,J,连接DH,IJ.图中两块阴影部分面积分别记为S1,S2.若S1:S2=1:4,S四边形边BAHE=27,则四边形MBNJ的面积为( )
A.9 | B.8 | C.7 | D.6 |
您最近一年使用:0次