Cho tam giác ABC nhọn nội tiếp đường tròn (O;R) với ABa/ Chứng minh 3 điểm P,Q,R thẳng hàng
b/ Kẻ đường cao AD và CE của tam giác ABC cắt nhau tại H. Đường kính BK cắt DE tại I. Chứng minh tứ giác DCKI nội tiếp đường tròn
c/ Kẻ CS vuông góc AM. CHứng minh PQ=SE
d/ Chứng minh tứ giác PSQE nội tiếp được

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