Question

[pham tuan dung]

1so sanh phan so 

12/25 va 25/49                         80/95 va 144/153

6 tinh gia tri bieu thucphanso

1phan 72+1phan56+1 phan 42+ 1phan 30 +1phan 20 + 1phan 12

7tinh nhanh phan so

17 phan 12+ 9phan 7-(2phan7 -7phan 12)

11phan7 nhan (38 phan 45 nhan 17 phan 11 )

(1+1phan2 ) nhan (1+1phan3 ) nhan ....... nhan (1+1phan2005

9 cho phan so 25phan 42 tim so tu nhien a sao cho khi them vao tu so cua phan so da cho va giu nguyen mau so thi duoc phan so moi bang 6phan 7