cho tứ diện SABC có SA vuông góc (ABC). gọi H,K lần lượt là trực tâm tam giác ABC và tam giác SBC.
a) chứng minh AH,SK,BC đồng quy
b)chứng minh SC vuông góc (BHK),HK vuông góc (SBC)
c) xác định dường vuông góc chung của BC và SA

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