Cho doan thang AB dai 8cm va mot diem C thuoc doan thang AB.Biet AC=4cm.

a)Diem C co phai la trung diem cua doan thang AB khong?Vi sao?

b)Goi D la trung diem cua doan thang AC.Tinh do dai doan thang BD.

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

Cho doan thang AB=8cm. goi I la trung diem cua doan thang AB va M la trung diem cua doan thang AI

a, tinh MB

b, then tia doi cuar tia IA lay diem N sao cho IN  = 8cm . hoi diem b co trung diem cua doan thang nao 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

C​o giao chu nhiem muon chia 24 quyen vo , 48 but bi va 36 tap giay thanh mot so phan thuong nhu nhau , moi phan thuong gom ca ba loai de phat thuong cho hoc sinh . Hoi co the chia duoc nhieu nhat bao nhieu phan thuong ? Moi phan thuong co bao nhieu quyen vo , bao nhieu but bi va bao nhieu tap giay ?

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

ve duong thang xy.Tren xy lay 2 diem I,B roi lay diem C sao cho I la trung diem cua doan thang BC. Lay diem D sao cho B la trung diem cua doan thang ID.

a) Co phai CD dai gap 3 lan IB khong?Vi sao?

b) Ve trung diem M cua IB. Vi sao diem M cung la trung diem cua CD?

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?

Cho doan thang AB=8cm.Goi M la trung diem cua doan thang AB. Tren doan thang AB lay c,d sao cho AC=BD=3cm.

a) Tinh CD

b) Diem M co la trung diem cua doan thang CD khong ? Vi sao ?