Muon so sanh hai phan so khac mau so, ta co the.........mau so hai phan so do, roi so sanh cac......cua hai phan so moi.

so sanh

n phan n+2 va n+3 phan n+5

So sanh cac phan so  

A,53/57 va 531/571

b,n+1/n+2 va n/n+3

/ la phan ngan cach giua tu so va mau so

mong cac ban tra loi nhanh giup minh 

so sanh phan so:

a) n/n + 3 va  n - 1/n+4         ( n  thuoc N)

b) n/n + 1 va n + 2/n + 3

c) n/2n + 1 va 3n + 1/6n + 3   ( n thuoc N)

tim hai phan so m/n biet rang tong m+n = 1188 nen n-m =198 roi rut gon phan so do thanh phan so tôi gian

so sanh hai so E =(3^n+1)+4*(2^n-1)-81*(3^n-3)-8*(2^n-2)+1 va F=(2^n+1)^2+(2^n-1)^-2*((4^n)+1)(n nguyen duong)

ban giup minh ve so do tu duy so sanh hai phan so voi nhe

ban hong nói: muon biet do dai cua 3 doan thang nao do tuong ung la do dai cua 3 canh cu 1 tam giac hay kg ta chi san so sanh do dai lon nhat voi tong do dai hai canh con lai hoac so sanh do dai nho nhat voi hieu hai do dai con lai. theo em ban hong noi dung hay sai? vi sao

1.Cho so N la so co hai chu so chia het cho 3.Neu viet xen so 0 vao giua hai chu so do roi cong no voi hai lan chu so hang chuc cua so N ta duoc so moi gap 9 lan so N.Tim so do

2.Tong hai so thap phan la 60,1.Neu dich dau phay cua so nho sang ben phai mot hang roi dem tru di so lon thi ta duoc 219,52.Tim hai so do.

3.Tim so co hai chu so biet neu ta them so 33 vao giua hai chu so do thi duoc mot so moi gap so phai tim 89 lan.