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bichphuongnvk39sp
2 năm trước
Câu 1 cho tam giác ABC cân tại B có MK là trung tuyến. Chứng minh tam giác ABK = tam giác CBK Câu 2 Cho tam giác ABC nhọn AM là đường phân giác ( M thuộc BC ) Kẻ MK ⊥ AB, MH ⊥ AC ( K thuộc AB H thuộc AC ) Chứng minh a MK = MH b Chứng minh AM là đường trung trực của đoạn thẳng KH c kẻ HM cắt AB tại D KM cắt AC tại E . Chứng minh tam giác ADE cân Yêu cầu vẽ hình và GT , KL
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