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thuhuyenhoang4
2 năm trước
giúp mình với ạ . Toán lớp 7 Bài 1. Cho tam giác DEF cân tại D. Kẻ DH EF EF ⊥ ∈ (H ). a) Chứng minh ΔDHE DHF = Δ ; b) Chứng minh H!DE = H!DF; c) Kẻ HM DE M DE ⊥ ∈ ( ) và HN DF DF ⊥ ∈ (N ). Chứng minh HM HN
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