Các câu hỏi tương tự
Cho doan thang AB, Diem O thuoc tia doi cua tia AB. Goi M, N thu tu la trung diem cua OA, OB.
a) Chung to rang OA < OB
b) Trong ba diem O, M, N diem nao nam giua hai diem con lai?
c) Chung to rang do dai doan thang MN khong phu thuoc vao vi tri cua diem O(O thuoc tia doi cua tia AB)
Cho doan thang AB, diem O thuoc tia doi cua tia AB. Goi M,N thu tu la trung diem cua OA,OB.
a, Chung to rang OA<OB
b, Trong ba diem O,M,N diem nao nam giua hai diem con lai?
Chung to rang do dai doan thang MN ko phu thuoc vao vi tri cua diem O[O thuoc tia doi cua tia AB]
Cho doan thang AB.Diem O thuoc tia doi cua AB.Goi M,Ntheo thu tu la trung diem cua OA,OB
a,Chung minh OA<OB
b,Trong 3 diem M,O,N diem nao nam giua 2 diem con lai
c,Chung to rang do dai doan thang MN khong phu thuoc vao vi ri diem O(O thuoc tia doi cua AB)
Giup minh voi
cho doan thang AB diem O thuoc tia doi cua tia AB goi M,N theo thu tu la trung diem cua OA,OB
a chung to rang OA<OB
b trong ba diem O,M,N diem nao nam giua hai diem con lai
c chung to rang do dai doan thang MN ko phu thuoacvao vi tri cua diem O ( O thuoac tia doi cua tia AB)
Tren tia Ox lay hai diem A va B sao cho OA = 3cm, OB = 6cm
a) Diem A co nam giua O va B khong ? Vi sao ?
b) Tinh do dai doan thang AB
c) DIem A co phai la trung diem cua OB khong ? Vi sao ?
d) Goi P la trung diem cua doan thang OA, Q la trung diem cua doan thang AB. Chung to OB = 2PQ.
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
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.Diem C thuoc tia doi cua tia BA.M la trung diem cua doan thang AB
a ) Chung to rang : CM =\(\frac{CA+CB}{2}\)
b ) Goi O la mot diem nam ngoai doan thang AB.Biet goc AOC = 120 do; goc BOC = 30 do;goc AOM = 60 do.Hoi OB co phai la tia phan giac goc MOC khong? Vi sao ?
BAI 1:
Tim so tu nhien n biet rang 13 chi het cho n - 1
BAI 2;
Ve hai tia doi nhau Ox va Oy , lay diem A thuoc tia Ox , lay diem B thuoc tia Oy sao cho OA = 2 cm , OB = 5 cm
a) Diem O co bam giua A va B khong ? Vi sao ?
b) Tinh do dai AB
c) Lay diem I la trung diem cua doan thang OB . Tinh do dai AI