cach nhan biet diem nam giua hai diem
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Ve hinh theo cach dien dat sau:
a, diem M nam giua hai diem A va B: diem N khong nam giua hai diem A va B (ba diem N,A,B thang hang)
b, Diem B nam giua hai diem A va N; diem M nam giua hai diem A va B
biet ba diem a,b,c thang hang diem c nam giua hai diem con lai co the chi do do dai cua hai doan thang ma biet dc ba do dai ab,ac,bc ko giai thich cach lam cua ban
Cho diem A nam giua hai diem M va N , diem B nam giua hai diem A va N , diem M nam giua hai diem A va K .Chung to rang:
a) Hai tia BM ,BN doi nhau
b) Hai tia MB, MK doi nhau
c) Tren hinh ve co bao nhieu tia phan biet ? co bao nhieu cap tia doi nhau
Cho diem C nam giua hai diem A va B, biet AB = 6cm. Goi M va N lan luot la trung diem cua cac doan thang AC va BC.
a) Tinh do dai doan thang MN.
b) Hay neu cach chon diem C de cho do dai doan thang MN gap 3 lan do dai doan MC.
Cho diem A nam giua hai diem M va N , diem B nam giua hai diem A va N , diem M nam giua A va K . Chung to rang :
a) Hai tia BM,BN doi nhau
b) Hia tia MB,MK doi nhau
c) Tren hinh ve co bao nhieu tia phan biet , Co bao nhieu cap tia doi nhau ?
a: B nằm giữa A và N nên NB<NA
A nằm giữa M và N nên NA<NM
=>NB<NM
=>B nằm giữa M và N
=>BM và BN đối nhau
c: Tia đối nhau: BM và BN, AM và AB, MK và MA
Tia phân biệt: KN,MA,AB,BN
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ve 4 diem A,B,M,N sao cho diem A nam giua M va B , diem N nam giua A va B
a ) hay cho biet diem A nam giua 2 diem nao .
b ) Tim cac diem nam cac phia doi voi A
cho ba diem C,D,E thang hang,biet CD=2,5cm,DE=8cm,CE=5,5cm.hoi trong ba diem C,D,E diem nao nam giua hai diem con lai
Vì điểm E nằm giữa 2 điểm D và C nên ta có
8 - 5,5 = DC hay DC = 3,5
Trong điểm D,C,E thì điểm C nằm giữa 2 điểm D và E
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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...
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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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Ve hinh theo yeu cau sau
Diem A nam giua hai diem M va N , diem B nam giua hai diem A va N , diem M nam giua hai diem A va K
Hinh ve:
N_____B_____A_____M_____K
Minh chi ve duoc den day thoi con lai ban tu hieu nha:
Chuc ban hoc tot!
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