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
trong mat phang cho 15 diem trong do co x diem thang hang qua 15 diem do ta ve duoc tat ca 91 duong thang tim x
cho truoc n diem trong do k co 3 diem nao thang hang ve duong thang di qua cac cap diem. Tim n biet rang neu co them 1 diem (k thang hang voi bat cu 2 diem nao trong tong so n diem da cho) thi so duong thang ve dc tang them 8 duong
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?
tren mat phang cho n duong thang trong do bat ky hai duong thang nao cung cat nhau va khong co ba duong thang nao cung di qua mot diem. biet rang tong so giao diem ma n duong thang do tao ra bang 465.tim n
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).
cho 2016 diem phan biet trong do co 2015 diem thang hang hoi ve dc bn duong thang di qua 2 trong 2016 diem noi tren
cho n diem trong do khong co 3 diem nao thang hang . Cu qua 2 diem ta ve 1 duong thang . Biet rang co tat ca 105 duong thang . tim n ?
tren mat phang cho 40 diem trong do co 30 diem thang hang hoi ve duoc tat ca bao nhieu tam giac tu 40 diem da cho?????????????
