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nguyenthaihoangphuong
2 năm trước
cho tam giác ABC đều , cạnh là a . I,K,M lần lượt là trung điểm của AB,AC,BC a) chứng mình : tứ giác BIKM là hình thoi b) các tam giác : AIK,KMC, là tam giác đều c) tính diện tích hình thoi BIKM và tam giác AIK, KMC
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