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[几何] 四边形求对角线

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tommywong Posted 2014-4-10 21:10 |Read mode
四边形ABCD满足AD=BD,∠ADC=3∠CAB.AB=√2,BC=√17,CD=√10,求AC
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现充已死,エロ当立。
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《方幂和及其推广和式》 数学学习与研究2016.

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乌贼 Posted 2014-4-11 00:09
两天前看过,没想出来

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isee Posted 2014-4-11 18:05
不知道有没暴力三角算法啊?给出结果再来猜猜几何法呀

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其妙 Posted 2014-4-11 18:08
这么难啊?居然难倒了楼上两位超级几何高手,弱渣几何不行,绕道走吧~

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isee Posted 2014-4-11 18:09
回复 4# 其妙


    条件没法用

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乌贼 Posted 2014-4-11 23:56
转人教群截图
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乌贼 Posted 2014-4-12 00:31

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