tim phan so toi gian a/b (a,b thuoc N*)nho nhat de khi nhan a/b voi phan so 16/75 hoac 14/165 deu duoc moi tich la mot so tu nhien
Chung minh tong cua 1so nguyen voi 1phan so toi gian la phan so toi gian
CMR: voi moi so tu nhien x ta deu co: P=(14x+3)/(21x+4) la mot phan so toi gian
tim n de 7n+4/5n+3 la mot phan so toi gian
tim so nguyen duong nho nhat de khi nhan no voi moi mot trong cac phan so toi gian 3/4, -5/11, 7/12 deu duoc tich la nhung so nguyen
tim so nguyen duong nho nhat de khi nhan no voi moi mot trong cac phan so toi gian 3/4;-5/11;7/12 deu duoc ket qua la nhung so nguyen
bo rang day du cua mot nguoi truong thanh la 32 chiec trong do co 12 cai rang ham hoi rang ham may phan tram tong so rang {viet duoi dang phan so toi gian}
chung minh rang : Voi moi n thi phan so 7n+4/5n+3 la phan so toi gian .
tim so tu nhien abcde biet 2a15b / cde = 90 (tat ca la so tu nhien )
tim phan so toi gian a/b nho nhat (a,bEN*) de khi nhan a/b voi 16/75 hoac 14/165 deu duoc moi tich la mot so tu nhien
