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xianglinh2020
2 năm trước
Cho tam giác nhọn DEF. Gọi A, B theo thứ tự là trung điểm của DE và DF. a) Chứng minh tứ giác ABFE là hình thang. b) Biết AB=15cm. Tính EF? Các bạn giúp mình vẽ hình luôn nha mình cảm ơn
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