Mathematics, 24.07.2021 01:30, kernlife

Cho tam giác IKL, O là giao điểm hai tia phân giác của góc K và góc L. P là giao điểm của 2 tia phân giác góc ngoài tại K và L. Chứng minh rằng I, O,P thẳng hàng

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Cho tam giác IKL, O là giao điểm hai tia phân giác của góc K và góc L. P là giao điểm của 2 tia phân...