Cho  9diem     phan  biet   va khong va khong co 3 diem nao thang hang.noi cac diem  voi nhau de tao thanh cac duong thang ,hoi co bao nhieu duong

Co 4 diem phan biet trong do khong co ba diem nao thang hang.Noi tat ca cac diem do lai voi nhau se co bao nhieu duong noi ?

 đố vui 

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 truoc mot so duong thang phan biet khong co 3 diem nao thang hang. So duong thang tao thanh tu cac diem do la 36, tinh so diem ?

1. Lay 4 diem A, B, C, D trong do khong co 3 diem nao thang hang. Ke cac duong thang di qua cac cap diem. Co bao nhieu duong thang tat ca? do la nhung duong thang nao? 

2. Lay 4diem M,N,P,Q trong do 3 diem M,N,P thang hang va diem Q nam ngoai duong thang do. ke caacacc duong thang di qua cac cap diem. co bao nhieu duong thang phan biet? viet ten cac duong thang do

mong cac ban giai ho minh!

cho 5 duong thang phan biet doi mot cat nhau, khong co 3 duong thang nao cat nhau tai 1 diem .hoi co bao nhieu giao diem

ve 2017 duong thang doi 1 cat nhau va khong co 3 duong thang nao dong quy. hoi co bao nhieu giao diem duoc tao thanh.

trong mat phang cho 10 diem phan biet, trong do khong co 3 diem nao thang hang.Hoi co the ve duoc bao nhieu tia, bao nhieu doan thang, bao nhieu duong thang? (neu trong diem phan biet do co 5 diem thang hang thi ve duoc bao nhieu tia, bao mhieu doan thang, bao nhieu duong thang).

So duong thang tao thanh  từ 5 diem phan biet trong do khong co 3 diem nao thang hang la bao nhiêu?