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Mathematics, 22.07.2021 09:30 depinedainstcom
cho tứ diện OABC có OA, OB, OC đôi một vuông góc với nhau, OA=a, OB= 2a, OC=a căn 3 tính khoảng cách từ O đến mặt phẳng ABC
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cho tứ diện OABC có OA, OB, OC đôi một vuông góc với nhau, OA=a, OB= 2a, OC=a căn 3 tính khoảng cách...
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