DAP AN:
3469-54 / 6938-108
= 3469-54 / 2x(3469-54)
=1/2
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Các câu hỏi tương tự
1.Rut gon cac phan so sau:
a)45/60=.....
b)54/135=.....
2.Dung ghi D,Sai ghi S:
a)Mot con ngua chay voi van toc 8 m/giay.Vay van toc cua con ngua tinh bang km/gio la:
A.28,8km/gio
B.48km/gio
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
cho phân số c/d. neu rut gon phan so c/d thi duoc phan so 2/5. neu giam tu so di 12 đv roi rut gon thi duoc phan so 4/25. tim phan so c/d.
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
Theo phan so c/d . Neu rut gon c/d phan so thi duoc phan so 6/7 . Neu gam tu so di 12 don vi roi rut gon thi duoc phan so 36/49 . Tim phan so c/d da cho .
rut gon 2 phan so sau : 13/125 , 201201/202202
tim phan so o tong cua tu so va mau sobang 49 va sau khi rut gon ta duoc phan so 2/5
tim phan so co mau so lon hon tu so 21 don vi va sau khi rut gon ta duoc phan so 4 phan 7
Cho phan so A/B co B-A = 21 . Phan so A/B sau khi rut gon thi duoc phan so la 16/23 .Tim A/B.