dien vao cho trong cho cac phat bieu sau:
a)hinh tao thanh boi diem O va 1 phan duong thang bi chia ra boi diem Oduoc goi la 1 .......................
b)diem R bat ki nam tren duong thang xy la goc chung cua.............................
c)neu diem A nam giua 2 diem B va C thi:
-hai tia............................doi nhau
-hai tia CA va ..........................................trung nhau
-hai tia BAva BC ...............................
Ve duong thang va mn cat nhau tai O . Trên tia Oxy lay diem A, tren tia Oy lay diem C( A,C khac O ). Trên tia doi cua tia Ox lay diem B . Lay diem Q bat ki , không thuoc mn . Hay ve ba diem B,Q,P thang hang sao cho P thuoc mn
Cho diem O nam tren duong thang xx'. Tren cac tia OX va OX' lay hai diem A va B khac O. Sao cho AB=12cm. Goi M,N lan luot la trung diem cua OA va OB.
1. Tinh MN. O co la trung diem cua MN ko. Vi sao?
2. Voi dk j thi AB va MN co cung trung diem
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?
Trên tia ox ve 2 diem M va N sao cho OM =4cm va ON=8cm
Trong 3 diem M ,O,N diem nao nam giua 2 diem con lai?Vi sao?
Chung to M la trung diem cua doan thang ON
Tren tia Oy la tia doi cua tia O x lay diem B sao cho O la trung diem cua P M.Chung minh PN =3×OP
dien vao cho trong cac phat bieu sau :
a)Bat ki duong thang nao nam tren mat phang cung la bo chung cua hai .........
b)cho 3 diem khong thang hang O,B,A .Tia Ox nam giua hai tia OA , OB khi tia Ox cat ......
tren tia ox cho doan thang oa=4cm; ob = 2cm hoi a) trong ba diem o;a;b thi dien nao nam giua hai diem con lai b)chung to diem b la trung dien cua doan thang oa c) ve tia oy la tia doi cua tia ox tren tia oy lay dien c sao cho oc =3 so sanh bc va oa d) goi diem d la trung diem cua doan thang oc tinh do dai doan thang bd
bai 1;cho 2 tia Ox vaOy khong doi nhau
a,ve duong thang aa' cat tia Ox va Oy lan luot tai A va B khac O.Ve diem M nam giua A va B.Ve tia OM.Ve tia ON la tia doi cua tia OM
b,chi ra nhung doan thang tren hinh
c,chi ra 3 diem thang hang tren hinh
bai 2;ve tia Ox.Ve tren tia Ox voi OA la 3cm;OB la 5cm;OC la 7cm
CMR diem B la trung diem doan thang AC
Tren tia Ox lay hai diem A,B sao cho OA = 2cm, OB = 9cm
a) chung to A nam giua hai diem O va B va tinh do dai AB
b) Tren tia Oy la tia doi cua Ox lay diem C sao cho OC = 5cm. tinh do dai CA
c) chung to A la trung diem cua doan thang CB