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 \(\frac{n+19}{n+6}\left(n\in N\right)\)
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
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 n-5phan3.n-14 la ps toi gian
cac phan so \(\frac{n+1}{2n+3}\)va\(\frac{2n+1}{2n+3}\)la cac phan so toi gian voi moi so nguyen n khac -1
tìm so tunhien n toi gian de cac ps sau deu toi gian
\(\frac{7}{n+9};\frac{8}{n+10};\frac{9}{n+11};............;\frac{30}{n+32};\frac{31}{n+33}\)
chứng minh rằng phân so \(\frac{n+1}{2n+3}\)la toi gian
Cho phan so: P = \(\frac{2n+7}{5n+2}\)(n thuoc Z)
a)Tim n thuoc z de P la phan so chua toi gian.
b)Tim n thuoc Z sao cho P la phan so toi gian.
chứng minh PS tối gianr (n thuộc N và n khác 0)
a) n/n+1
b) A=2n+1/3n+1
c)12n+1/30n+2
