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beomummim2k
2 năm trước
cho khẳng định sau 1. tứ giác ABCD là hbh <=> vecto AB = vecto CD 2. tứ giác ABCD là hbh <=> vecto AD = vecto CB 3. Nếu vecto AB = vecto DC thì tứ giác ABCD là hbh 4. Nếu vecto AD = vecto CB thì 4 điểm A,B,C,D theo thứ tự đó là 4 đỉnh hbh có bao nhiêu khẳng định sai (giải chi tiết ra giúp mik nhé)
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