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nguyenphuocsang04012004
2 năm trước
trên tia ox lấy hai điểm a và b sao cho oa=6cm,ob=12cm a) tính ab ,b)điểm a có là trung điểm của ob không ? vì sao ? c) gọi m là trung điểm của đoạn thẳng oa . tính mb. d) vẽ tia oy là tia đối của ox .trên tia oy lấy điểm n sao cho on =3cm chứng tỏ o là trung điểm của đoạn thẳng mn
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