H
hoa2011


lap phuong trinh mat phang (p)cat Ox,Oy,Oz tai A,B,C thu tu sao cho the tich tu dien OABCD lon nhat,biet OA binh phuong+OB binh phuong+OC binh phuong=12
http://diendan.hocmai.vn/showthread.php?t=100696
http://diendan.hocmai.vn/showthread.php?t=100696
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