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
tim phan so nho nhat khac 0 sao cho khi chia no cho 14/9 , cho 45/27 ta deu duoc thuong la cac so tu nhien
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 mot trong cac phan so : 3/4 : -5/11 ;7/12 deu duoc tich la so nguyen
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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
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 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 toi gian a/b nho nhat khac 0 sao cho khi chia a/b cho phan so 8/15,18/35 deu duoc ket qua la cac so nguyen
tim p/s lon nhat sao cho khi chia cac p/s 28/15;21/10;49/84 cho no ta deu duoc thuong la so tu nhien