tren duong thang xy lay 2015 diem phan biet khi do em hay tinh xem tren duong thang do co bao nhieu doan thang

cho duong thang xy va diem O nam tren duong thang xy tren tia Ox lay diem E sao cho OE=3cm.tren tia Oy lay diem G sao cho EG=6cm a)tren 3 diem O,E,G thi diem nao nam giua hai diem con lai ? vi sao b) tinh do dai doan thang OG. tu do cho biet diem O co la trung diem cua doan thang EG khong?

cho hai duong thang a va b song song. tren duong thang a lay 10 diem phan biet, tren duong thang b lay 15 diem phan biet. hoi co the ve bao nhieu duong thang phan biet  qua 2 trong cac diem da cho ?

cho diem O thuoc duong thang xy. tren tia Ox lay diem A sao cho OA 3cm, tren tia Oy lay diem B,C sao cho OB = 9cm, OC = 1cm.

a) tinh do dai doan thang AB,BC

b) goi M la trung diem cua doan thang BC. tinh CM ; OM

Tren duong thang x,y lay o.Lay diem a thuoc tia ox,B thuoc tia oy sao cho OA=2cm;OB=2oa

A)Tinh do dai doan AB?

B)Goi Yla trung diem cua OB.Chung minh O la trung diem cua doan thang AI

C) Tren duong thang xy lay 100 diem diem phan biet(khac O,A,B,I).Noi 2 diem ta duoc mot doan thang.Hoi co bao nhieu duong thang tao thanh?

giup minh voi! HELP ME!!!!!

tren duong thang xy lay them 2012 diem M1, M2,M3,..,M2012 phan biet voi nhau va phan biet voi cac diem A, B,O,I co the ve duoc bao nhieu goc dinh C ma cac canh la cac tia goc C va di qua cac diem da cho tren duong thang xy

1. Tren 1 duong thang xy lay 4 diem phan biet A,B,C,D hay chi ra cac tia doi nhau 

2. cho 10 diem trong do khong co ba diem thang hang . Cu qua hai diem ta ve duoc 1 duong thang . Hoi co tat ca bao nhieu duong thang?

3. cho n diem trong do khong co ba diem nao thang hang . Cu qua hai diem trong so cac diem do ve duoc 1 duong thang. Biet rang co 435 duong thang tao thanh .Tim n?

cho 2 duong thang xy va zt cat nhau tai diem B.Tren Bx lay diem A, tren By lay diem C sao cho BA=BC=3 cm, tren Bz lay diem D,tren Bt lay diem E sao cho BD=2,5 cm va BE bang 2 BD

Hay tinh doan thang DE va BE

Tren duong thang d lay 2016 diem phan biet tinh so doan thang tren hinh ve duoc tao nen tu 2016 cac diem do