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caokyanh.nguyen
2 năm trước
Cho tâm giác ABC có góc A=80 độ góc B=60 độ AD là phân giác của góc BAC , Đ thuộc BC a) tính góc ADC b) vẽ ĐỂ sao cho góc ADE=80 độ E thuộc AC. Chứng minh BD = DE c) chứng minh AD là trưng trực của BE đ)từ Đ kẻ DM vuông góc với AB, M thuộc AB DN vuông góc với ÁC N thuộc AC chứng minh AM =AN e) c/m MN//BE
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