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Mathematics, 24.07.2021 03:50 selenamoreno8713

Trong không gian, cho hình chiếu 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 chiếu OABC có OA, OB, OC đôi 1 vuông góc và cùng độ dài a . Chứng minh rằ...

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