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Cho tứ diện ABCD với G₁, G₂ lần lượt là trọng tâm của tâm giác ACD, BCD. Chứng minh rằng đường thẳng G₁G₂ song song với mặt phẳng (ABC)
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in piramida triunghiulara regulata VABC cu varful in V, notam cu M mijlocul muchiei [BC]. Daca muchia - Brainly.ro
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