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trungkien90711
2 năm trước
Giup mik voi Cho tam giác ABC có (AB=AC )trung tuyến BD, CE vuông góc với nhau tại G .Gọi I,K lần lượt là trung tuyen GB,GC â, Tứ giác DEIK là hình gì và chứng minh b, tính Sdeik , biết CE =12cm c.tính Sedc d.tinh Sbcde
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