tim phan so lon nhat sao cho khi chia cac phan so 28/15; 21/10; 49/84 cho no ta deu duoc ket qua la mot so tu nhien
1 hcn co dt la 8/15cm2.cd la 4/3 cm.
a,tinh chu vi hcn do
b,tim phan so toi gian a/b lon nhat(a,bthuoc N*)sao cho khi chia moi phan so 22/75,16/35 cho a/b ta duoc ket qua la so tu nhien
cho hai phan so 8/5 va 18/15.tim so lon nhat sao cho khi chia moi phan so nay cho phan so do ta duoc ket qua la so nguyen
tim phan so toi gian nho nhat co tu va mau la cac so tu nhien sao cho khi nhan phan so do lan luot voi cac phan so 10/7;5/6;15/9 thi moi tich tim duoc la so tu nhien.
tim phan so co gia tri nho nhat ma tu va mau la cac so tu nhien sao cho khi nhan phan so nay lan luot voi cac phan so 2\3,4\5,6/7 thi moi tich tim duoc deu la cac so tu nhien
tim phan so toi gian nho nhat co tu va mau la cac so tu nhien sao cho khi nhan phan so lan luot voi moi so \(\frac{10}{7};\frac{5}{6};\frac{15}{9}\)thi moi tich tim duoc la so tu nhien
tim phan so nho nhat khac 0 ma khi chia phan so cho 35/66;28/105;25/231 ta duoc ket qua la so tu nhien
tim phan so a/b lon nhat dekhi chia cho cac phan so 2phan 5,3phan7, 4phan 9cho a phan b thi duoc thuong la cac so tu nhien
tim phan so nho nhat khac 0 sao cho khi chia phan so do cho 14/9 va 45/27 ta duoc thuong la so tu nhien
