cho diem o nam giua a va b diem b nam giua hai diem a va c . giai thich tai sao diem b nam giua hai diem o va c

cho diem onam giua hai diem a va b , diem c nam giua diem hai diem o va b

 a, ke ten hai tia trung nhau goc o

 b, tai sao co the khang dinh diem o nam giua hai diem a va c

tren tia ox lay cac diem a b c sao cho oa = 3cm ob =6cm oc= 5cm 

tinh ab cb

giai thich vi sao diem c nam giua 2 diem a va b 

giup minh voi 

cam on 

ve tia Ox,lay M va N nam giua Ox sao cho OM=4cm ON=8cm;

a/ M co nam giua hai diem Ova N khong.vi sao.

b/tinh MN

c/giai thich vi sao M la trung diem cua ON

d/ve tia Oy la tia doi tia Ox lay K sao cho OK=4cm,goi I la trung diem cua KN.tinh KI

lay ba diem khong thang hang a,b,c .ve hai tia ab,ac.ve hai tia ab , ac

a, ve tia ay cat duong thang bc tai diem m nam giua b va c

b,ve tia ay cat duong thang bc tai diem n khong nam giua b va c

Cho hai duong thang xy va zt giao nhau tai diem O. Lan luot tren cac tia Ox, Oy,Oz,Ot lay cac diem A,B,C,D sao cho AO = 2cm; CO = DO = 3cm; BO = 2AO. Giai thich tai sao diem O la trung diem cua doan thang CD

cho doan thang MP tren do lay diem P sao cho PM<AP tren tia doi cua tia AM lay diem Q sao cho AQ=PM goi B la trung diem cua doan thang AM

a/ trong 3 diem  A B C diem nao nam giua 2 diem con lai?

b/ giai thich tai sao trung diem cu doan thang QM cung la trung dim cua doan thang AP

Ve 5 diem A,B,C,D sao cho 3 diem A,B,C thang hang, 3 diem B,C,D thang hang, 3 diem C,D,E khong thang hang

a) Giai thich vi sao 3 diem A,B,D thang hang

b) Tren hinh ve hay tim diem nam giua 2 diem con lai

Lay 3 diem khong thang hang A,B,C ve hai tia AB,AC

Ve tia Ax cat duong thang BC tai diem M nam giua B va C

Ve tia Ay cat duong thang BC  tai diem N ko nam giua B,C