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thailocthanh
2 năm trước
1. Cho tam giác abc nội tiếp đtron (o), 2 đg cao ad,bk cắt nhau tại h. Ad cắt (o) ở e a) CMR bc là tia phân giác của hbe b) CMR e đối xứng vs H qua BC 2. Cho (O,R) đkinh ab thì dây ad cắt nhau ở e nằm trong (o). CMR ae.ad+be.bc=4r^2
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