已知:如图,∠ABC=∠ADC=90°,M、N分别是AC、BD的中点,AC=10,BD=8,则MN=_____ .
![](https://img.xkw.com/dksih/QBM/2020/5/13/2462088039677952/2462485016313857/STEM/9feb8a96975c41f6bcd28bfdec5903b6.png?resizew=111)
更新时间:2020-05-14 12:41:30
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【推荐1】如图,
为边长不变的等腰直角三角形,
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,
,
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②
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关于
的对称点
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④
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旋转,当点
落在
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落在
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其中正确结论的序号是________ .
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①
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②
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③作点
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④
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【推荐2】如图,Rt△ABC中,∠ACB=90°,BC=2,AB=6,D,E分别是AB,AC的中点,以DE、DC为邻边作▱DEFC,点F在BC的延长线上,则▱DEFC的周长是___
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