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khunglong1736
2 năm trước
cho tam giac ABC có A=90 độ ,AC=5cm ,BC=13cm .Gọi K la trung diem cua canh AB,D la diem doi xung voi C qua K a, tư giac ADBC la hinh gi? vi sao b,Goi M la trung diem canh BC. chung minh MK vuong goc AB c,tinh dien tich tam giac ABC
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