cho bieu thuc A=3n+2/n+1(n thuoc Z;n khac -1. chung minh A la ps toi gian voi moi gia tri cua n
cho PS \(A=\frac{2n-3}{n-2}\) (n thuôcZ;n khac 2).chứng minh A la ps toi gian
cmr neu ps 7n2+1/6 la so tu nhien voi n la so tu nhien thi cac ps n/2 va n/3 la cac ps toi gian
chung minh 14.n+3/21.n+5 toi gian
CHO PS \(\frac{n+19}{n+6}\left(n\in N\right)\)
A , tim gia tri cua n de ps co gia tri la so tu nhien
B, tim gia tri cua n de ps toi gian
giup minh vs
Chung minh rang moi phan so dang n+1/2n+3 ( n thuoc N ) deu la phan so toi gian.
chung minh rang : Voi moi n thi phan so 7n+4/5n+3 la phan so toi gian .
Giup to bai nay voi : Chung minh voi n thuoc N sao phan so sau la phan so toi gian 4n+1/6n+1
cho phan so p=6n+5/3n+2 (n thuoc N)
chung minh rang phan so p la phan so toi gian
giup minh nhe
