如图,在矩形ABCD中,
,
,动点M从点A出发,以每秒1个单位长度的速度沿A→B→C的路径匀速运动,过点M作对角线AC的垂线,垂足为N.设运动时间为t秒,△AMN的面积为S,则下列图象能大致反映S与t之间函数关系的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987614546862080/2990801910235136/STEM/2d526a0b-13d4-4cd4-92aa-eb3671be99b9.png?resizew=230)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987614546862080/2990801910235136/STEM/2d526a0b-13d4-4cd4-92aa-eb3671be99b9.png?resizew=230)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2022-05-30 23:04:58
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【推荐1】我们知道,可以借助于函数图象求方程的近似解.如图(甲),把方程
的解看成函数
的图象与函数
的图象的交点的横坐标,求得方程
的解为
.选择:三次方程
的根的正负情况是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/08a63517-ac6b-4880-9f77-36e602ad4934.png?resizew=183)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3787a3817a275a764dd798d83018ee3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/08a63517-ac6b-4880-9f77-36e602ad4934.png?resizew=183)
A.有两个负根,一个正根 | B.有三个负根 |
C.有一个负根,两个正根 | D.有三个正根 |
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【推荐2】如果在二次函数的表达式y=ax2+bx+c中,a>0,b<0,c<0,那么这个二次函数的图象可能是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】如图,
,射线
和线段
互相垂直,
为线段
上一点,点
在射线
上,且
,作
,并截取![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e124258c2c6844adb5706b0f1502e83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
,连接
并延长交射线
于点
,设
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,矩形
中,
,
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![](https://img.xkw.com/dksih/QBM/2021/1/30/2647138557804544/2652042070646784/STEM/a0b4bea6-d594-4387-b9c7-75a5a043e9a4.png)
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A.![]() | B.![]() |
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