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chungtinh_4311
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cho góc tam diện vuông Oxyz .Điểm N cố định nằm trong góc tứ diện ,mp (P)qua N cắt Ox,Oy,Oz tại A,B,C .Gọi d(N/(OBC),(OCA),(OAB)).là a,b,c
a)Tính OA,OB,OCđể tứ diện OABC(MIN)
b)Tính OA,OB,OC để OA+OB+OC(MIN)b-(b-(b-(
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![Roll Eyes :rolleyes: :rolleyes:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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a)Tính OA,OB,OCđể tứ diện OABC(MIN)
b)Tính OA,OB,OC để OA+OB+OC(MIN)b-(b-(b-(