Ta có:
\(\frac{20}{78}=\frac{20:2}{78:2}=\frac{10}{39}\)
\(\frac{68}{90}=\frac{68:2}{90:2}=\frac{34}{45}\)
\(\frac{500}{547}\) là phân số tối giản, không thể rút gọn thêm
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 .
Hay giup to chuyen phan so thap phan 14,92 thanh phan so roi rut gon
rut gon phan so 45,123
Rut gon phan so 102102/103103
rut gon phan so 25/10
rut gon phan so 122448/132652
rut gon phan so 135/315
