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29 tháng 10 2017

điểm B

29 tháng 10 2017

B nằm giữa A B C 3cm 1cm  

a: Trên tia Oa, ta có: OC<OD

nên điểm C nằm giữa hai điểm Ovà D

b: Ta có: C nằm giữa O và D

nên CO+CD=OD

hay CD=2,5cm

c: Ta có: C nằm giữa O và D

mà CO=CD

nên C là trung điểm của OD

19 tháng 11 2017

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