the nao la doan thang de do do dai doan thang ta lam nhu the nao
ve tuy y 3 diem A , B , C thang hang . Lam the nao de chi do 2 lan ma biet duoc do dai cua cac doan thang AB , BC , CA
cho ba diem a,b,c sao cho b nam giua a,c lam the nao chi do hai lan ma biet duoc do dai cua ca ba doan thang ab,bc,ac, hay neu cach lam khac nhau
cho 100 doan thang A1 ,A2 ,A3 ....... ,A100trong do khong co ba diem nao thang hang .Goi S la tong cac doan thang nhan 2 diem trong cac diem do lam dau mut . So sanh Sva 5000
mot nguoi tho phai lam cac khung thep hinh chu nhat co chieu dai 35cm chieu rong 30cm de lam dai cho cot be tong cot thep neu dung 260m day hep thi nguoi do lam bao nhieu khung thep nhu vay
biet ba diem a,b,c thang hang diem c nam giua hai diem con lai co the chi do do dai cua hai doan thang ma biet dc ba do dai ab,ac,bc ko giai thich cach lam cua ban
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 ?
.Một hoc sinh khang dinh rang cho toi 1 thuoc co GHĐ 1m toi se chi can dung thuoc do do 1 lam la co the biet duoc san truonng dai bao nhieu met
a) ban do phai lam the nao de thuc hien loi noi cua minh
b)ket qua ban thu duoc co chinh xac ko tai sao
Cho diem C nam giua hai diem A va B, biet AB = 6cm. Goi M va N lan luot la trung diem cua cac doan thang AC va BC.
a) Tinh do dai doan thang MN.
b) Hay neu cach chon diem C de cho do dai doan thang MN gap 3 lan do dai doan MC.