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nhanvo722118
2 năm trước
Giải hộ e câu này ạ: Cho tam giác ABCD,C là đường trung tuyến AD,BE,CF trong đó AD vuông góc vs BE,AD=3cm,BE=4cm. a)vẽ điểm K sao cho D là trung điểm EK.CM: AFKD là hình bình hành b) Tính độ dài CF
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