Tren tia Ox lay 2 diem A va B sao cho OA=15cm,OB=25cm
a,Tinh AB=?
b,Ve diem C tren tia doi Ox sao cho O la trung diem cua CB.Tinh CB=/
c,tren tia Ox lay D sao cho OD=30cm,tren tia doi DO lay E.Chung to rang:EO=2.EA-ED.
KHONG CAN VE HINH NHA.THUC RA DAY LA TOAN NANG CAO NHE.
Kirito =)
la sao??????