ok
de\(\dfrac{2n+3}{4n+8}\) thi
goi d la UC(2n+3;4n+8)
co 2n+3 chhia ht cho d
4n+8 chia ht cho d
co 2(2n+3)chia het cho d
co 1(4n+8) chia ht cho d
2(2n+3)-1(4n+8)chia het cho d
2 chia ht cho d
nhung day la so le
vay 1 chia ht cho d
suy ra.............\(\dfrac{2n+3}{4n+8}\)