cho ps 27 \44 hoi phai them stn nao vao tu va giu nguyen mau de duoc ps rut gon =3\4
cho phân số a/b, rút gọn phân số a/b ta duoc phan so 5/6. neu thêm 8 don vi vao mau so b ma giu nguyen tu so a thi ta duoc phan so moi. rut gon phan so moi ta duoc phan so 3/4. tim phan so a/b
tim 1 ps biet rang neu cong them 4 vao ts va giu nguyen ms thi ta duoc ps moi = 1 con neu giu nguyen ts va cong them 3 vao ms thi ta duoc ps moi = 1/2 ps do la
cho phan so a/b . Neu rut gon phan so a/b thi ta duoc phan so 3/4 . Neu cong them 15 don vi vao tu so roi rut gon thi duoc phan so 7/6. Tim phan so a/b
cho phan so 23/35 tim mot so tu nhien biet rang neu cung them so tu nhien do vao ca tu so va mau so da cho ta duoc phan so moi va sau khi rut gon phan so moi nay ta duoc 5/7.
cho phan so 54/36 . tim so tu nhien a sao cho khi bot a o tu so , them a vao mau so cua phan so ta duoc phan so moi . rut gon phan so moi ta duoc 4/5
tim PS a/b biet a-b=21.PS a/b sau khi rut gon duoc PS16/23 .Tim PSa/b
Tim 1 phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi ta duoc phan so moi bang 1, con neu giu nguyen tu so va cong them 3 vao mau so thi ta duoc phan so moi bang 1/2
Tim 1 phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi ta duoc phan so moi bang 1,con neu giu nguyen tu so va cong them 3 vao mau so thi ta duoc phan so moi bang 1/2