15.如图2正四面体abcd的棱长为1h是顶点d的底面 Abc上的射影m在dh上且使得∠abc=90°则dm的长 为 ——青夏教育 Template




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tomski15.如图2正四面体abcd的棱长为1h是顶点d的底面 abc上的射影m在dh上且使得∠abc=90°则dm的长 为 coloring