Mathematics, 14.06.2021 16:40 angelina0miles

Cho tứ diện ABCD. Chứng minh rằng AB⊥CD, AC⊥BD, AD⊥BC khi và chỉ khi AB2 + CD2 = AC2 + BD2 = AD2 + BC2

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Cho tứ diện ABCD. Chứng minh rằng AB⊥CD, AC⊥BD, AD⊥BC khi và chỉ khi AB2 + CD2 = AC2 + BD2 = AD2 +...