Trong mat phang chon 6 diem phan biet, trong do khong co 3 diem nao thang hang. voi 3 diem bat ki trong 6 diem do luon co 2 diem ma khoang cach nho hon 673. CMR trong 6 diem da cho luon tim duoc 3 diem la 3 dinh cua mot tam giac co chu vi nho hoc 2019
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cho 99 diem tren mat phang trong do co 2 diem A va B cach nhau 3 cm. Moi nhom3 diem bat ki cua cac diem da cho bao gio cung co the chon ra 2 diem co khoang cach nho hon 1 cm. ve duong tron (A 1 cm)(B 1 cm). CMR trong 2 duong tron do co mot duong tron chuait nhat la 50 diem trong cac diem da cho.
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).
Nếu ko có 3 điểm nào thẳng hàng thì vẽ đc 45 đường thẳng và 90 tia
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cho 99 diem tren mat phang trong do co 2 diem a va b cach nhau 3cm ,moi nhom ,3diem bat ki cua cac diem da cho bao gio cung co the chon ra 2 diem co khoang cach nhỏ hơn 1 cm
Cho truoc n diem trong do ko co 3 diem nao thang hang.Ve cac duong thang di qua cac cap diem,Tim n biet rang neu co them 1 diem(ko thang hang voi bat ki 2 diem nao trong so n diem da cho) thi so duong thang ve duoc tang them la 8.
Minh dang can gap!Cac ban giup minh voi nhe!
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 6 diem trong do khong co 3 diem nao thang hang So duong thang di qua 2 diem trong 6 diem da cho
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?
Cau 5: Trong cac khang dinh sau, khang dinh nao dung, khang dinh nao sai?1.Ba diem phan biet la ba diem thang hang.2.Voi ba diem phan biet luon co hai diem nam ve cung phia doi voi diem con lai.3.Voi ba diem thang hang phan biet luon co hai diem nam khac phia voi diem con lai.4.Voi ba diem A,B,C thang hang thi diem B luon nam giua hai diem A,C.5.Co mot va chi mot duong thang di qua hai diem (phan biet) cho truoc.6.Hai duong thang phan biet thi song song voi nhau.7.Hai tia chung goc thi cung nam...
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Cau 5: Trong cac khang dinh sau, khang dinh nao dung, khang dinh nao sai?
1.Ba diem phan biet la ba diem thang hang.
2.Voi ba diem phan biet luon co hai diem nam ve cung phia doi voi diem con lai.
3.Voi ba diem thang hang phan biet luon co hai diem nam khac phia voi diem con lai.
4.Voi ba diem A,B,C thang hang thi diem B luon nam giua hai diem A,C.
5.Co mot va chi mot duong thang di qua hai diem (phan biet) cho truoc.
6.Hai duong thang phan biet thi song song voi nhau.
7.Hai tia chung goc thi cung nam tren mot duong thang.
8.Hai tia chung goc thi doi nhau
9.Neu diem M nam giua diem A,B thi no la trung diem cua doan thang AB.
10.Neu MA=MB thi M la trung diem cua doan thang AB.
11.Neu MA+MB= AB va MA=MB thi M la trung diem cua doan thang AB.
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cho 20 diem phan biet , trong do co dung 7 diem thang hang , ngoai ra khong co 3 diem nao thang hang.cu qua 2 diem ta ve duoc 1 duong thang.hoi tu 20 diem do ta ve duoc bao nhieu duong thang