Cho phan so 37/83 .Hay tim mot so tu nhien m sao cho khi them m vao tu so va bot m o mau so cua phan so da cho thi duoc phan so moi co gia tri bang 5/7
cho phan so 25 phan 37 hay tim so tu nhien a sao cho dem mau so cua phan so da cho tru di a va giu nguyen tu so thi duoc phan so moi co gia tri 5 phan 6
cho phan so 20/59. hay tim so tu nhien a sao cho khi them a vao ca tu so vao mau so cua phan so da cho ta duoc phan so moi co gia tri bang 2/5
cho phan so 25/39 . Hay tim so tu nhien sao cho khi them vao tu so va giu nguyen mau so , ta duoc phan so moi co gia tri la 2/3
Cho phan so 82/103. Hay tim so tu nhien m sao cho khi them m vao ca tu va mau cua phan so da cho thi ta duoc phan so moi bang phan so 5/6?
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cho phan so 15/39 tim mot so tu nhien biet rang khi cong them so do vao mau so cua phan so da cho va giu nguyen tu so thi duoc phan so moi co gia tri bang 3/11
cho phan so 53/75 hay tim so tu nhien m sao cho khi cong them m vao tu va mau cua phan so da cho thi ta duoc phan so moi bang phan so 3/4
cho phan so 34/41. Hayc tim so tu nhien n biet neu bot n o tu so va them n vao mau so cua phan so tren thi duoc phan so moi co gia tri la 2/3
cho phan so 25/35 .hay tim so tu nhien c sao cho dem mau so cua phan so da cho tru di c va giu nguyen tu so ta duoc phan so moi co gia tri 5/6