Cho doan thang AB =8cm . Tren tia AB lay diem M sao cho AM=3cm 

a)Tinh do dai doan thang BM 

b)Goi N la trung diem cua doan thang BM . tinh do dai doan thang MN

c)Lay diem P htuoc tia doi cua tia AB sao cho MP=6cm . Hoi A co la trung diem cua doan thang MP ko ?vi sao

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

Tren doan thang AC dai 12cm lay diem B  sao cho AB = 5cm

a) Tinh do dai cua doan thang BC

b) Goi MN lan luot la trung diem cua cac doan thang AB, AC.Tinh do dai doan thang MN

c) Lay D thuoc tia doi cua tia CA sao cho CD = 7cm.CTR diem C la trung diem cua doan thang BC

tren tia Ax lay 2 diem B và C sao cho AB=6cm , AC=10cm . tinh do dai doan thang BC . Goi M la trung diem doan thang AB va N la trung diem cua doan thang AC . Tinh do dai doan MN

cho doan thang mn=10. Tren tia MN ve diem P sao cho doan thang MP co do dai bang 5cm 

a.Trong ba diem M,N,P diem nao nam gua 2 diem con lai

b.So sanh do dai doan thang MP va PN

c.Diem P co la trung diem cua doan thang MN khong ? Vi sao ?

Tren doan thang AB=10cm lay diem M.Tren tia doi cua tia AB lay diem N sao cho AM=AN. 

a, Tinh do dai doan thang BN khi BM=3cm

b,Hay xac dinh vi tri cua M tren doan thang AB de BN co do dai lon nhat

cho doan thang ab co do dai =60.goi c la tia doi cua ab sao cho ca=ab goi m la trung diem cua doan ac goi m la trung diem cua doan thang mb .tinh doan thang mn

cho doan thangAB co do dai 4dm8cm.M la trung diem cua doan thang AB ;E va D lan luot la trung diem cua doan thang AB vaMB.Tinh do dai doan thang ED?

Tren tia Ax, ve diem B sao cho AB=2cm. Ve diem M sao cho B la trung diem cua AM 

a) Tinh do dai doan thang AM,BM 

b)Tren duong thang AB lay diem N sao cho BN=3cm . tinh do dai doan thang MN