Ta có: \(\frac{2n+1}{n+2}=\frac{2\cdot\left(n+2\right)-3}{n+2}=2-\frac{3}{n+2}\)
Để \(\frac{2n+1}{n+2}\)có giá trị là số nguyên thì \(\frac{3}{n+2}\)là số nguyên
\(\Leftrightarrow n+2\varepsilonƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)
Ta có bảng sau:
| \(n+2\) | \(1\) | \(-1\) | \(3\) | \(-3\) |
| \(n\) | \(-1\) | \(-3\) | \(1\) | \(-5\) |
Vậy \(n\varepsilon\left\{-5;-3;-1;1\right\}\)
tim so nguyen n de phan so 4n+5/2n-1 co gia tri la mot
so nguyen
Cho A=n+3/n+2 voi n€z
a)tim dieu kien cua so nguyen n de A la phan so
b)tinh gia tri cua phan so A khi n=1;n=-1
c)tim so nguyen n de phan so A co gia tri la so nguyen
A=n-1/n+2
a, Voi gia tri nao thi A la phan so
b, Tim so nguyen n de A=0
c,tim so nguyen n de A co gia tri nguyen
tim tat ca cac gia tri nguyen cua n de phan so A=3n+2/n-1 co gia tri la so nguyen
tim gia tri nguyen n de phan so M=2n-7/n-5 co gia tri nguyen
viet ca cach giai nhe
pp
tim n thuoc z de phan so sau a=4n-1/2n+3 co gia tri nguyen
tim cac gia tri nguyen cua n de phan so 6n-3 / 3n +1 co gia tri la so nguyen
tim n thuoc n de cac phan so sau co gia tri nguyen 2n+3/7
Cho phan so A = 2n-1/n+3
Tim so nguyen n de A co gia tri la 1 so nguyen
pls, lam nhanh cho minh,mai di hoc :(. Thanks truoc
