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phmvung456
2 năm trước
Bài 10: Cho đoạn thẳng MN = 8cm. Gọi R là trung điểm của MN. a) Tính MR và RN. b) Lấy P, Q trên đoạn MN sao cho MP = NQ = 3cm. Tính PR, RQ. c) Điểm R có là trung điểm của đoạn PQ không? Vì sao? a, Ta có: MR = RN = 1/2 MN = Mn/2 = 8/2 = 4 (cm) b, MP+PQ+QN = 8 cm ⇒ 3.2 + PQ = 8cm ⇒ PQ = 8-6 = 2 (cm) Ta có: PR = RQ = 1/2 PQ = PQ/2 = 2/2 = 1(cm) Vậy a, MR = RN = 4 (cm) b, PR = RQ = 1 (cm) anh em làm mỗi câu c thôi nha
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