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 ?
so duong thang tao thanh tu 10 diem phan biet trong do khong co 3 diem nao thang hang
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?
So duong thang tao tu 10 diem trong do co dung 3 diem thang hang
So duong thang tao thanh từ 5 diem phan biet trong do khong co 3 diem nao thang hang la bao nhiêu?
cho 50 diem trong do co dung m diem thang hang , ngoai ra ko co 3 diem naop thang hang. cu qua 2 diem ta ve duoc 1 duong thang .so duong thang ve duoc la 1215 duong thang.tim m
Cho 7 diem trong do co dung 4 diem thang hang, cu qua 2 diem ta ve duoc 1 duong thang . so duong thang ve duoc la bao nhieu ?
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 7 diem trong do co dung 4 diem thang hang cu qua 2 diem ta ve duoc 1 duong thang so duong thang da ve la