Ai giúp em voi huuuuuuuuuuuuu

[tuyha88]

[TẶNG BẠN] TRỌN BỘ Bí kíp học tốt 08 môn
Chắc suất Đại học top - Giữ chỗ ngay!!

ĐĂNG BÀI NGAY để cùng trao đổi với các thành viên siêu nhiệt tình & dễ thương trên diễn đàn.

Cho tam giac ABC(AB>AC), đường trung tuyến AD
Chứng minh goc ADB>ADC
E là một điểm bất kì trên đoạn AD. Chứng minh BE>EC

 

[healthyeconomy]

a) Ta có AB>AC==> góc ADB>ADC (quan hệ giữa cạnh và góc đối diện)
b) Từ câu a ta lại có BD > CD (quan hệ giữa góc và cậnh đối diện)

 

[healthyeconomy]

Bài này wá dễ luôn ó. Mà hog bít lèm thôi chứ bít j òy nha...

 

[healthyeconomy]

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[healthyeconomy]

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[katoriitto]

a) Ta có AB>AC==> góc ADB>ADC (quan hệ giữa cạnh và góc đối diện)
b) Từ câu a ta lại có BD > CD (quan hệ giữa góc và cậnh đối diện)
Ra rồi đó