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Để \(\frac{3n-1}{n-1}\)là số nguyên thì 3n-1 chia hết cho n-1 nên \(\frac{3n-1}{n-1}=\frac{2n+n-1}{n-1}=\frac{2n+\left(n-1\right)}{n-1}\Rightarrow2n⋮n-1\)nhưng \(n-1⋮n-1\Rightarrow2n⋮n-1\)\(\Rightarrow2⋮n-1,n⋮n-1\Rightarrow n-1\in\left\{1;-1;2;-2\right\}\)mà \(n\ne1\left(n-1=1-1=0\right)\)\(\Rightarrow n\in\left\{-1;2;-2\right\}\)
tap hop cac so nguyen n de \(\frac{n}{n+3}\)co gia tri la so nguyen la S = {...}
tim so nguyen n de phan so sau co gia tri la so nguyen
A=\(\frac{6n+5}{2n-1}\)
tim cac so nguyen n de phan so sau co gia tri nguyen
2n+3 / 7
tim cac gia tri nguyen cua x de gia tri bieu thuc y=2x^2+1/2x-1 la so nguyen
TIm x thuoc Z de cac ps sau co gia tri la so nguyen :
D = \(\frac{2x-3}{x-1}\)
TIm x thuoc Z de cac ps sau co gia tri la so nguyen :
D = \(\frac{2x-3}{x-1}\)
Tim n de phan so sau co gia tri nguyen va tinh gia tri do:
A=3n+9/n-4
Cho Bt : n-3/n-5
a,Tinh gia tri cua A biet n = 6
b,So nguyen n phai co dieu kien gi de A la phan so ?
c, Tim n de A nhan gia tri nguyen
cho A=\(\frac{\sqrt{x}+1}{\sqrt{x}-3}\)(x\(\ge\)0)
tim so nguyen de A co gia tri la so nguyen