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

cho 2 duong thang xy va zt cat nhau tai diem B.Tren Bx lay diem A, tren By lay diem C sao cho BA=BC=3 cm, tren Bz lay diem D,tren Bt lay diem E sao cho BD=2,5 cm va BE bang 2 BD

Hay tinh doan thang DE va BE

Cho doan thang AB dai 5 cm. Tren doan thang AB lay diem C sao cho AC = 3 cm

a, Lay diem D thuoc tia doi cua tia BC sao cho BD = 2 cm. So sanh do dai hai doan thang CD va AB

Mong cac ban giup minh, minh can truoc 9h

cho doan thang ab dai 6cm tren tia ab lay diem c sao cho ac=4cm a chung to rang diem c nam giua a va b b tinh do dai doan thang cb c lay diem d thuoc duong thang ab sao cho bd=3cm tinh do dai doan thang cd

tren doan thang AC co do dai 12 cm ,lay diem B sao cho AB=5 cm .a, tinh do dai cua doan thang BC.b,goi M,N lan luot la trung diem cua doan thang AB ,BC . tinh do dai doan thang MN.c, lay diem D thuoc tia doi cua tia CA sao cho CD =7 cm . chung to rang diem C la trung diem cua doan thang BD

cho doan thang AB bang 6 cm,lay dem C thuoc doan thang AB sao cho BC bang 4cm

a)tinh do dai doan thang AC

b)tren tia doi cua tia CA lay diem D sao cho CD bang 6 cm so sanh AB va BD

Tren duong thang xy lay 1 diem O va hai diem M,N sao cho Om = 2 cm; ON = 3 cm. Ve cac diem A va B tren duong thang xy sao cho M la trung diem cua OA; N la trung diem cua OB. Tinh do dai AB ( cach lam nua va dung noi ten ban ra)

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 duong thang xy lan luot lay cac diem A,B,C theo thu tu do sao cho AB= 6 cm, AC=8cm .

a) Tinh do dai BC

b) Goi M la trung diem cua doan thang AB, so sanh MC va AB ?