Mathematics, 23.07.2021 07:10 organicmemez

trong không gian, cho hình chóp OABC có OA, OB, OC đôi 1 vuông góc và cùng độ dài a. Chứng minh rằng OA vuông góc BC

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trong không gian, cho hình chóp OABC có OA, OB, OC đôi 1 vuông góc và cùng độ dài a. Chứng minh rằng...

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