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toploxo12
2 năm trước
cho đường (o;r) có dây CD cố định và H là trung điểm của CD. Gọi s là một điểm bất kì trên tia đối của tia DC. Qua Sker 2 tiếp tuyến SA,SB tới đường tròn tâm O(A,B là tiếp điểm ).Đường thẳng AB cắt SO tại E. A) 4 Điểm O,H,A,S cùng thuộc 1 đường tròn B)OE.OS=R2 Giải giúp ,ik vs nhanh
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