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Toán học - Lớp 7
21/04/2022 12:36:11
Giải bài có thưởng!

Chứng tỏ tam giác ABC vuông tại A

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----- Nội dung dịch tự động từ ảnh -----
N(x)
P(x) – Q(x)
Câu 2: (2,5 điễm).
Cho ABC có AB = 3 cm; AC = 4 cm; BC = 5 cm.
a) Chứng tỏ tam giác ABC vuông tại A.
b) Vẽ phân giác BD (D thuộc AC), từ D vẽ DE 1 BC (E e BC). Chứng minh DA :
DE.
=
c) ED cắt AB tại F. Chứng minh: DF > DE.
Câu 3 (005 điể,
0 trả lời
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