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balasao247
2 năm trước
1.Cho tứ giác ABCD, M,N lần lượt là trung điểm AD và BC O trung điểm MN Chứng minh vto 4IO = vto IA cộng vto IB cộng vto IC cộng vto ID với I là điểm bất kỳ 2.Xác định vtri điểm D sao cho tman vto AB trừ vto AC bằng vto BA trừ vto DB
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