cho n diem noi tung cap 2 diem trong n diem do thanh cac doan thang.tinh n biet rang co tat ca 435 doan thang

cho n diem .ve cac  doan thang noi 2 trong n diem do .co tat ca 45 doan thang .tinh n

cho 100 diem noi tung cap 2 diem trong 100 diem do thanh cac doan thang tinh so doan thang tao ra nếu trong 100 điểm đó có:

a,ko co 3 diem nao thang hang

b,co dung 5 diem thang hang

c,neu tao ra 105 doan thang thi can bao nhieu diem

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 n diem cu noi 2 diem ta ve duoc mot doan thang.

a)Hoi co tat ca bao nhieu doan thang

b)Tim n biet so doan thang ve duoc la 55

tren nua mat phang cho n diem phan biet, trong do co dung 3 diem thang hang. Qua 2 diem ta ve mot doan thang. biet so doan thang la 171. Tim n

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 10 diem.Noi tung cap 2 diem trong 10 diem do thanh cac doan thang.Tinh so doan thang ma 2 mut thuoc tap 10 diem da cho .Neu trong cac diem da cho:

a) khong co 3 diem nao thang hang

b) co dung 3 diem thang hang

Cho truoc n diem trong do ko co 3 diem nao thang hang.Ve cac duong thang di qua cac cap diem,Tim n biet rang neu co them 1 diem(ko thang hang voi bat ki 2 diem nao trong so n diem da cho) thi so duong thang ve duoc tang them la 8.

Minh dang can gap!Cac ban giup minh voi nhe!