若实数x,y满足
,则以x,y的值为边长的等腰三角形的周长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209719cd03e3fb18291d651aa2bc0b65.png)
更新时间:2023-08-08 21:12:30
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【推荐1】如图,在正方形
中,
,点O是对角线
的中点,点Q是线段
上的动点(点Q不与点O,A重合),连接
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【推荐2】用7根火柴棒首尾顺次连接摆成一个三角形,能摆成不同的三角形的个数为_____ .
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【推荐1】若
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【推荐2】如图,从热气球C上测得两建筑物A、B底部的俯角分别为29.5°和45°,如果这时气球的高度CD为100米,则建筑物A、B之间的距离为_____ (结果精确到1米).[参考数据:sin29.5°≈0.49,cos29.5°≈0.87,tan29.5°≈0.57]
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