cho cac diem A va B thuoc duong thang a .diem C nam giua A va B .diem D nam giua C va B
a)tim tren duong thang a nam cung phia doi voi diem C diem nam khac phia doi voi diem C
b) tim tren hinh ve cac tia doi nhau goc C ,cac tia trung nhau goc C
c) vi sao diem C nam giua A va D
Ve hai diem A va B cung thuoc duong thang xy va diem C khong thuoc duong thang xy .Ve tia BC
a.ke ten cac doan thang
b.ke ten hai tia doi nhau goc B
c.ve diem D nam giua hai diem A va B . hoi hai tia DX va BY co la hai tia doi nhau ko ? vi sao ?
bai 1;cho 2 tia Ox vaOy khong doi nhau
a,ve duong thang aa' cat tia Ox va Oy lan luot tai A va B khac O.Ve diem M nam giua A va B.Ve tia OM.Ve tia ON la tia doi cua tia OM
b,chi ra nhung doan thang tren hinh
c,chi ra 3 diem thang hang tren hinh
bai 2;ve tia Ox.Ve tren tia Ox voi OA la 3cm;OB la 5cm;OC la 7cm
CMR diem B la trung diem doan thang AC
Tren duong thang xy lay 4 diem A,O,B,E sao cho O nam giua A va B , B nam giua O va E . Hay ke ten :
a) cac cap tia doi nhau
b) cac tia goc A trung nhau , cac tia goc O trung nhau
c0 Co bao nhieu tia phan biet tren hinh ve ?
1.Tim cac so tu nhien x sao cho:
a/6 chia het cho (x-1) b/14 chia het cho (2.x+3)
2.Ve hinh de thay rang moi cau sau day la sai
a/Hai tia chung goc luon la hai tia doi nhau
b/Hai tia chung goc luon la hai tia trung nhau
c/Hai tia chung hoc luon la hai tia phan biet
d/Hai tia co nhieu diem chung chi khi chung la hai tia trung nhau
e/Hai tia phan biet va co chung goc luon la hai tia doi nhau
f/Hai tia ko chung goc luon la hai tia khong co diem chung
3/
a/Ve 3 diem thang hang A,B,C sao cho diem B nam giua hai diem A,C.Sau do hay ke ten:cac tia,cac cap tia doi nhau,cac cap tia phan biet,cac cap tia trung nhau co trong hinh ve do.
b/Ve 4 diem A,B,C,D tren mot duong thang sao cho diem B nam giua hai diem A,C va diem C nam giua hai diem B,D.Sau do hay ke ten:cac tia,cac cap tia doi nhau,cac cap tia phan biet,cac cap tia trung nhau co trong hinh ve do.
~~~~~~~~~~~~~Giup tui voi!!!!!~~~~~~~~~~~~~~
Cho 2 doan thang a , b cat nhau tia O , M thuoc q , M thuoc b
a, hay ve diem A sao cho M nam giua O va A roi ve diem B sao cho B nam giua O va N
b, goi I la diem cua 2 doan thang AB va MN . Diem I nam giua 2 diem nao . Diem I co nam giua A va N khong
tren tia ox cho doan thang oa=4cm; ob = 2cm hoi a) trong ba diem o;a;b thi dien nao nam giua hai diem con lai b)chung to diem b la trung dien cua doan thang oa c) ve tia oy la tia doi cua tia ox tren tia oy lay dien c sao cho oc =3 so sanh bc va oa d) goi diem d la trung diem cua doan thang oc tinh do dai doan thang bd
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
Ve tia OX , tren tia OX ve cac doan thang OA = 2cm va doan OB = 6cm
a) Trong 3 diem O , A,B diem nao nam giua ? Vi sao ?
b)So sanh OA va OB
c ) Goi I la trung diem doan OB . Trong 3 diem A,O,I diem nao nam giua 2diem . V i sao? Tinh do dai AI
