tren duong thang xy lay 10 diem phan biet. hoi co bao nhieu tia phan biet, co bao nhieu cap tia phan biet

cho hai duong thang a va b song song. tren duong thang a lay 10 diem phan biet, tren duong thang b lay 15 diem phan biet. hoi co the ve bao nhieu duong thang phan biet  qua 2 trong cac diem da cho ?

Tren duong thang d lay theo thu tu cac diem A1, A2, A3... A2000 va 1 diem B nam ngoai duong thang d. Co bao nhieu tam giac ma 3 dinh la cac diem noi B voi A1, A2, A3... A2000         ( giup voi, sao hong ai giup tui vay, help)

tren mot duong thang song song lay n diem a1,a2,a3,....an .qua cac diem nay ve cac duong thang song song voi nhau .tinh gia tri cua n de trong hinh co dung 100 tia

bai 1;cho 4 diem A,B,C,D.  trong do khong co 3 diem nao thang hang. hoi co bao nhieu tam giac ma co 3 dinh la 3 trong 4 diem tren.

bai 2;   cung hoi nhu bai 1, voi 10 diem A1,A2,A3,............A10

                 GIUP TO VOI

tren duong thang xy cho m diem phan biet. hoi co bao nhieu tia tren hinh ve

tren duong thang xy lay them 2012 diem M1, M2,M3,..,M2012 phan biet voi nhau va phan biet voi cac diem A, B,O,I co the ve duoc bao nhieu goc dinh C ma cac canh la cac tia goc C va di qua cac diem da cho tren duong thang xy

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 duong thang xy lay 2015 diem phan biet khi do em hay tinh xem tren duong thang do co bao nhieu doan thang