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luongminhhang2002
2 năm trước
Cho đoạn thẳng AB dài 12 cm, lấy điểm C nằm giữa A và B sao cho BC = 6 cm. a) Tính độ dài đoạn thẳng AC b) Điểm C có là trung điểm của đoạn thẳng AB không? Vì sao? c) Lấy điểm M nằm giữa A và B ( điểm M khác điểm C ). Gọi E và F lần lượt là trung điểm của AM và BM. Tính độ dài đoạn thẳng EF
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