cho 3 diem A,B,C khong thang hang 

a)Ve duong thang AB, doan thang BC,tia AC.Lay dien M tren duong thang AB sao cho B,M nam cung phia so voi diem A

b)Ve tia Ax la tia doi cua tia AC.Lay diem N sao cho A la trung diem cua doan CN(ve tren cung 1 hinh)

Ve hinh theo các cách diem dat sau : cho 3 diem A, B,C không thang hang . Ve tia AB ,doan thang AC, duong thang BC . Ve tia Bx cat doan AC tai D cho D la trung diem cua doan thang Ac

ve hinh theo cach dien dat sau:

-cho 3 diem A,B,C khong thang hang

-ve hai tia ab,ac

-ve ay la tia doi cua tia ac

-lay i la trung diem cua doan thang bc

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 

cho 3 diem A,B,C khong thang hang.Ve 2 tia AB , AC

Ve duong thang a di qua 2 diem B va C

Ve 2 tia Ay cat duong thang BC tai diem N ( N khong nam giua B va C )

Ve tia doi cua tia Ay.Tren tia doi cua Ay lay diem M sao cho AM=3cm

Giai chi tiet rui mik like nha

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 ba diem A,B,C khong thang hang

-ve hai tia AB , AC

-ve tia At la tia doi cua tia AC

-LAY diem I la trung diem cua doan thang BC

cho cac duong thang a,b,c .Biet a cat b tai diem A, b cat c tai diem C , a cat c tai diem B 

a / chi ra cac doan thang co tren hinh ve 

b/ ve tia AD a tia doi cua tia AC ,ve tia BE la tia doi cua tia BC

c/ lay diem M thuoc tia AC .ve tia AM

ve hinh cho to nha

cho 3 diem A,B,C, khong thang hang,ve doan thang BC

ve diem M la trung diem cua doan thang BC

ve tia BA,duong thang AC

ve duong thang AD sao cho M nam giua A va D