cho n diem trong do ko co 3 diem nao thang hang.cu qua 2 diem vẽ mot duong thang.so duong thang ve duoc tat ca la 153.khi do:
Cho 100 diem trong do co dung 4 diem thang hang ngoai ra ko co 3 diem nao thang hang.Cu qua 2 diem ta ve 1 duong thang.Hoi co tat ca bao nhieu duong thang?
Cho 100 diem trong do co dung 4 diem thang hang,ngoai ra khong co 3 diem nao thang hang.Cu qua 2 diem lai ve 1 duong thang.Hoi co tat ca bao nhieu duong thang?
Cho 7 diem trong do co dung 4 diem thang hang.Cu hai diem ta ve duoc 1 duong thang. tinh so duong da ve
cho 40 diem trong do co dung 5 diem thang hang.cu qua 2 diem bat ki ta ve duoc mot duong thang.hoi ve duoc may duong thang
cho n diem trong do ko co 3 diem nao thang hang. Cu qua 2 diem ve 1 duong thang so duong thang ve duoc la153
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
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
Bai 1: Cho 60 diem trong do co 15 diem thi cu qua 2 diem ve duoc 1 duong thang . Hoi ve duoc bao nhieu duong thang ? Bai 2:Cho n diem ko co 3 diem nao thang hang cu qua 2 diem ve duoc 1 duong thang . Biet ve duoc 28 duong thang . Tinh so diem n ?
