Cho phan so 17/35 tim mot so tu nhien sao cho khai tu so cong voi so do va giup nguyen mau so thi duoc phan so moisture bang 5/7
Cho phan so 35 phan 49 . Tim mot so tu nhien sao cho khai mau so tru so do va tu so giu nguyen thi duoc phan so moi bang 7 phan 8
Loi giai cu the
Cho phan so 24/45.tim mot so tu nhien sao cho khi lay mau so cong voi so do va giu nguyen tu so ta duoc phan so moi bang phan so 1/5
cho phan so 35/45 .tim mot so tu nhien sao cho khi dem tu so cong so do va giu nguyen mau so thi ta duoc phan so moi co gia tri bang 8/9 . so phai tim la
cho phan so 35 / 39 . Hay tim mot so tu nhien sao cho khi them so do vao mau so cua phan so da cho va giu nguyen tu so thi ta duoc phan so moi bang 5/6 . tim so tu nhien do
cho phan so 13 phan 27,hay tim mot so tu nhien sao cho khi cong tu so voi so do va giu nguyen mau so ta duoc phan so moi co gia tri bang 7 phan 9,lam ntn vay binh
Tim mot so sao cho khi tu so cua phan so 13/36 cong voi so do va giu nguyen mau so thi duoc phan so moi bang 5/9.
a) viet so le nho nhat co 4 chu so biet so do lon hon 2000 va chia het cho 9
b) cho phan so 27/72 tim mot so tu nhien sao cho khi tu so cong voi so do va giu nguyen mau so thi duoc phan so moi bang 5/6
cho phan so 35/39 hay tim mot so tu nhien sao cho khi cong so do vao mau so cua phan so da cho va giu nguyen tu so thi dc phan so moi = 5/6