Tren duong thang x,y lay o.Lay diem a thuoc tia ox,B thuoc tia oy sao cho OA=2cm;OB=2oa
A)Tinh do dai doan AB?
B)Goi Yla trung diem cua OB.Chung minh O la trung diem cua doan thang AI
C) Tren duong thang xy lay 100 diem diem phan biet(khac O,A,B,I).Noi 2 diem ta duoc mot doan thang.Hoi co bao nhieu duong thang tao thanh?
giup minh voi! HELP ME!!!!!
cho diem O thuoc duong thang xy. tren tia Ox lay diem A sao cho OA 3cm, tren tia Oy lay diem B,C sao cho OB = 9cm, OC = 1cm.
a) tinh do dai doan thang AB,BC
b) goi M la trung diem cua doan thang BC. tinh CM ; OM
Bai 1:toan giai
Cho diem O thuoc duong thang xy.Tren tia O lay diem A,sao cho OA=1cm,tren tia Oy lay diem B,C sao cho OB=3cm,OC=2cm
a) tinh do dai doan thang BC,AC
b) chung minh rang B la trung diem cua doan thang AC
c) goi M la trung diem cua doan thang BC.tinh BM,OM
cho diem o thuoc duong thang xy.tren tia ox lay diem a sao cho oa=3cm,tren tia oy lay diem b,c sao cho ob=9cm,oc=1cm
a tinh do dai doan thang ab;bc
b goi m la trung diem cua doan thang bc.tinh cm,om
giup mink voi ai nhanh mink tick nee
cho diem O thuoc duong dang xy.tren tia Ox lay diem A sao cho OA=3cm,tren tia Oy lay diem B,C sao cho OB=9cm,0C =1cm
a,tinh do dai doan thang AB,BC
b,goi M la trung diem cua doan BC.tinh CM,OM
cho duong thang xy va diem O nam tren duong thang xy tren tia Ox lay diem E sao cho OE=3cm.tren tia Oy lay diem G sao cho EG=6cm a)tren 3 diem O,E,G thi diem nao nam giua hai diem con lai ? vi sao b) tinh do dai doan thang OG. tu do cho biet diem O co la trung diem cua doan thang EG khong?
Ve duong thang xy va Ola mot diem nam tren duong thang .Tren tia Ox lay diem A,tren tia Oy lay diem B sao cho OA=2cm,OB=5cm
a)Tinh do dai AB?
b)Tren tia doi cua tia Ox lay diemN sao cho ON=2ON. Goi M la trung diem cua AB .Tinh do dai MN?
cho diem o tren duong thang xy . tren duong thang do dat cac doan oa=2 cm,ob=3cm , roi lay diem e va f sao cho a la trung diem cua doan thang oe, b la trung diem cua doan thang of.tinh do dai doan ef
( sorry cac bn nhe may tinh cua mk ko danh duoc dau nhung chac cac bn dich ra duoc. thanh that xl nhe )
tren duong thang a lay 2 diem A va B sao cho AB=2cm lay diem C sao cho A la trung diem cua doan thang BC lay diem D sao cho B la trung diem cua doan thang AD a)tinh do dai doan thang CD b) goi trung diem cua AB la M tim trung diem cua doan thang CD
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