7 dg thang trong do 2 dg thang bat ki nao cung cat nhau. Hoi co it nhat bn giao diem ?nhieu nhat bn giao diem
tiep
Cho n diem ko co ba diem nao thang hang. Qua 2 diem trong so cac diem do ve 1 dg thang. Bt rang co 435 dg thang tao thanh. Tim n
Ghi loi giai
cho 10 duong thang phan biet doi 1 cat nhau trong do khong co 3 duong thang .Hoi co bao nhieu giao diem tao thnh rut ra ket luan
cho 100 diem thang hang trong do co dung 4 diem thang hang cu qua 2 diem ta ve 1 dg thag hoi co tat ca bn dg thg
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 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 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
cho 2006 đường thẳng , trong đo bat ki 2 dg thang nao cx cat nhau . ko co 3 dg thang nao dong qui . tinh so giao diem
AI NHANH TAY MIK KICK LIEN , MIK DG CAN GAP
Bai 1:Cho n duong thang (n>2) doi mot cat nhau va ko co 3 duong thang nao cung di qua mot diem. Hoi so giao diem n duong thang noi tren co the la 2014 duoc ko?
Bai 2; ve 4 duong thang phan biet va cat nhau doi mot.So giao diem co the la bao nhieu?