四个全等的直角三角形围成一个大正方形,中间空出的部分是一个小正方形,这样就组成了一个“赵爽弦图”(如图),其直角三角形的两条直角边长分别为2和3,则小正方形与大正方形的面积比是( )
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865137498939392/2866638062682112/STEM/a70a6c68081a48b5ab4bf74a23cd3582.png?resizew=76)
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865137498939392/2866638062682112/STEM/a70a6c68081a48b5ab4bf74a23cd3582.png?resizew=76)
A.1:13 | B.1:14 | C.2:9 | D.2:15 |
更新时间:2021-12-08 16:27:03
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【推荐1】如图,在等腰
中,
,F是AB边上的中点,点D、E分别在AC、BC边上运动,且保持
.连接DE、DF、EF.在此运动变化的过程中,下列结论:①
是等腰直角三角形;②DE长度的最小值为4;③四边形CDFE的面积保持不变;④△CDE面积的最大值为8.其中正确的结论是( )
![](https://img.xkw.com/dksih/QBM/2012/6/6/1573400099946496/1573400138457088/STEM/63d0e51359764328be0b6ed5aa01781b.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/2012/6/6/1573400099946496/1573400138457088/STEM/9d06f85f3978475d89568f0f6c8b1a9a.png?resizew=69)
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![](https://img.xkw.com/dksih/QBM/2012/6/6/1573400099946496/1573400138457088/STEM/f9c33b3dcf3742ca87b34c8ca6d4bf89.png?resizew=65)
![](https://img.xkw.com/dksih/QBM/2012/6/6/1573400099946496/1573400138457088/STEM/7a4943f0137e4021bdd41b2469afec16.png?resizew=52)
![](https://img.xkw.com/dksih/QBM/2012/6/6/1573400099946496/1573400138457088/STEM/63d0e51359764328be0b6ed5aa01781b.png?resizew=148)
A.①③④ | B.②③④ | C.①②④ | D.①②③ |
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单选题
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【推荐2】如图,
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于点
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A.![]() | B.![]() | C.![]() | D.![]() |
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