co 5 diem trong do khong co 3 diem nao thang hang
a . co bao nhieu bao tam giac cac diem lam dinh
b . neu co n diem thi co bao oxythang 1 duongtam nhan cac diem lam dinh
Cho 50 diem phan biet, trong do co 5 diem thang hang. Qua 2 diem bt ky ta ke duoc 1 duong thang. Hoi co tat ca bao nhieu doan thang nhan 2 trong 50 diem do lam dau mut.
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).
a/cho 6 diem trong do ko co 3 diem nao thang hang
b/cho 7 diem trong do ko co 3 diem nao thang hang
hoi so dg thang di qua 2 diem la bao nhieu
cho 6 diem phan biet , trong do ko co 3 diem nao thang hang. Ve dc bao nhieu duong thang di qua cac cap diem?
cho 6 diem phan biet, trong do ko co 3 diem nao thang hang. Ve dc bao nhieu duong thang di qua cac cap diem
cho 1000 diem phan biet trong do co dung 3 diem thang hang hoi co bao nhieu duong thang tao thanh boi 2 trong 1000 diem do
Cho n diem( n thuoc N;n>=3) trong do khong co ba diem nao thang hang. Co bao nhieu tam giac ma cac dinh la 3trong n dinh do
Giup mik voi:(
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?