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mhienle
2 năm trước
Cho tứ giác `ABCD` và hai mệnh đề: `P:` Tổng hai góc đối của tứ giác bằng `180^o;Q:` Tứ giác nội tiếp một đường tròn. Hãy phát biểu mệnh đề kéo theo `P=>Q` và xét tính đúng sai của mệnh đề này.
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