如图,在平面直角坐标系
中,抛物线
的顶点为M,直线
与x轴平行,且与抛物线交于点A和点B,如果
为等腰直角三角形,我们把抛物线上A、B两点之间部分与线段
围成的图形称为该抛物线的准蝶形,顶点M称为碟顶,线段
的长称为碟宽.抛物线
的碟宽为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d92dc7f59572fc5aeba24c37ef09a3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4d12362d4b8dd25813953e1c5a94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef476b5e912aca6ae9494fcba5a2b2b.png)
![](https://img.xkw.com/dksih/QBM/2021/10/3/2821613942915072/2821910215188480/STEM/0a72515e-b8c4-4076-be77-d16b165cb400.png)
更新时间:2021-10-04 08:13:56
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【推荐1】如图,菱形
的边长为
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【推荐2】已知
为抛物线
上任意两点,当
时,对于
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【推荐1】如图,用12 m长的木条,做一个有一条横档的矩形窗子,为使透进的光线最多,选择窗子的高AB为___ .
![](https://img.xkw.com/dksih/QBM/2018/1/15/1860785653047296/1860968932089856/STEM/a656eecb35b94cceb3c2f698b7da3cc2.png?resizew=36)
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【推荐2】如图,正方形ABCD的顶点A,B与正方形EFGH的顶点G,H同在一段抛物线上,且抛物线的顶点同时落在CD和y轴上,正方形边AB与EF同时落在x轴上,若正方形ABCD的边长为4,则抛物线的解析式为____ ,正方形EFGH的边长为____ .
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【推荐1】已知三条不同的直线a、b、c在同一平面内,下列四条命题:
①如果a//b,a⊥c,那么b⊥c;
②如果b//a,c//a,那么b//c;
③如果b⊥a,c⊥a,那么b⊥c;
④如果b⊥a,c⊥a,那么b//c.
其中真命题的是__________ .(填写所有真命题的序号)
①如果a//b,a⊥c,那么b⊥c;
②如果b//a,c//a,那么b//c;
③如果b⊥a,c⊥a,那么b⊥c;
④如果b⊥a,c⊥a,那么b//c.
其中真命题的是
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【推荐2】如图,已知
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于
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于
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【推荐1】如图,在矩形纸片
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【推荐2】如图,在
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