Ve mot hinh khac co 5 duong thang cat nhau tung doi mot va co 10 giao diem
Ai biet giup minh ve voi minh rat cam on !
Những câu hỏi liên quan
Bai 1:Cho n duong thang (n>2) doi mot cat nhau va ko co 3 duong thang nao cung di qua mot diem. Hoi so giao diem n duong thang noi tren co the la 2014 duoc ko?
Bai 2; ve 4 duong thang phan biet va cat nhau doi mot.So giao diem co the la bao nhieu?
Ve tren cung mot hinh theo cach dien dat sau :
a)Ve 4 diem A ,B ,C D sao cho C nam giua A, B va 3 diem A, B D ko thang hang . Hay ve va ke ten duong thang (phan biet) di qua tung cap diem .
b) Ve diem E sao cho E va D nam khac phia doi voi A . Ve diem F sao cho C,E,F thang hang va F thuoc duong thang DB
Cho 10 diem thuoc duong thang a va 5 diem khong thang hang, nam ngoai duong thang a. Qua 2 diem thi ve mot duong thang .Hoi co the ve duoc bao nhieu duong thang phan biet ? ( Co ve hinh )
Ai nhanh mình tik và kết bạn.Cảm ơn rất nhiều
Xin chao moi nguoi,cac gia su. MINH CO MOT BAI TOAN LOP7 CHUA LAM DUOC,XIN MOI NGUOI GIANG DAY: Cho biet tam giac AMN vuong tai A,co AMAN. a)Cho biet tam giac AM12cm,MN37cm.Tinh do dai canh AN va so sanh cac goc trong tam giac AMN. b)Goi I la trung diem cua AN.Tu diem I ve duong thang vuong goc voi AH tai I,duong thang nay cat MN tai diem B.Chung minh tam giac ABIt/giac NBI c)Tren tia doi cua tia BA lay diem C sao choBC BA,CI cat MN tai D.C/minh MN3ND Minh xin moi ngu...
Đọc tiếp
Xin chao moi nguoi,cac gia su. MINH CO MOT BAI TOAN LOP7 CHUA LAM DUOC,XIN MOI NGUOI GIANG DAY: Cho biet tam giac AMN vuong tai A,co AM<AN. a)Cho biet tam giac AM=12cm,MN=37cm.Tinh do dai canh AN va so sanh cac goc trong tam giac AMN.
b)Goi I la trung diem cua AN.Tu diem I ve duong thang vuong goc voi AH tai I,duong thang nay cat MN tai diem B.Chung minh tam giac ABI=t/giac NBI
c)Tren tia doi cua tia BA lay diem C sao choBC =BA,CI cat MN tai D.C/minh MN=3ND
Minh xin moi nguoi chi giup, hay lien he voi minh khi ban co cau tra loi gan nhat .Xin cam on(moi nguoi ve hinh luon a!)
ve 4 duong thang chung cat nhau doi mot ,chung co 4 giao diem
cho 5 duong thang phan biet doi mot cat nhau, khong co 3 duong thang nao cat nhau tai 1 diem .hoi co bao nhieu giao diem
Cho hinh binh hanh ABCD va diem O nam trong hinh do. Ve cac diem A',B',C',D' doi xung voi O qua A,B,C,D. Chung minh rang tu giac A'B'C'D' co mot tam doi xung .😊😀cac ban oi cho minh hoi voi minh can gap lam cam on nhiu
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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3 tháng 2 2016 lúc 19:59
trên cạnh CD cua mot hinh vuong ABCD ta lay mot diem M khac C va D. Cac duong tron duong kinh CD va AM cat nhau tai diem thu 2 la N (khacD) . Tia DN cat BC tai P. Chung minh rang : AC vuong goc PM
(day la bt khó to nghĩ 2 ngảy roi ma k lam dc mong co bạn nào gioi toan giup do
cam on nhieu lam)