Mathematics, 07.09.2021 15:10 alizeleach0123

7. Cho 4 điểm A, B, C, D cùng thuộc một đường tròn tâm O và M là điểm nằm trong đường tròn đó. Chứng minh rằng trung điểm của MA, MB, MC, MD cùng nằm trên một đường tròn,

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7. Cho 4 điểm A, B, C, D cùng thuộc một đường tròn tâm O và M là điểm nằm trong đường tròn đó. Chứng...