bai 1 : cho 3 diem V, A , T thang hang . diem nao nam giua 2 diem con lai neu :
TV + VA = TA
bai 2 : tren 1 duong thang , hay ve 3 diem V , A , T sao cho TA = 1 cm , VA = 3 cm . hoi diem nao nam giua 2 diem con lai
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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
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Bài 1: V
Bài 2: A