Mathematics
Mathematics, 08.02.2022 14:00, bri9263

Cho ( O; R) và điểm D nằm ngoài ( O) vẽ tiếp tuyến DA và DF ( A, F là tiếp điểm) đường thẳng DO cắt (O) tại C và B ( điể C nằm giữa D và B). Gọi H là hình chiếu của A trên BF. I là trung điểm AH. BI cắt đtròn ( O) tại E, DE cắt ( O) tại P a) CM: Tứ giác DAOF ntieeps và DA^2 = DE. DP
b) CM: DC. DB = DK. DO
C) CM: Tứ giác AEKI ntieeps, rồi suy ra FE vuông góc với DP

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Cho ( O; R) và điểm D nằm ngoài ( O) vẽ tiếp tuyến DA và DF ( A, F là tiếp điểm) đường thẳng DO cắt...

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