\(\dfrac{a^2+5a+4}{a+5}=\dfrac{a\left(a+5\right)+4}{a+5}=\dfrac{a\left(a+5\right)}{a+5}+\dfrac{4}{a+5}=a+\dfrac{4}{a+5}\)Nên \(4⋮a+5\)
\(\Rightarrow a+5\inƯ\left(4\right)=\left\{\pm1;\pm2;\pm4\right\}\)
Dễ r :(
tap hop cac so nguyen a de a^2+a+3/a+1 la so nguyen la
A=\(\dfrac{\sqrt{x-3}}{2}\) Tim x de A la so nguyen
cho x, y la cac so nguyen duong sao cho A = x^4 + y^4 / 15 cung la so nguyen duong . cmr : x va y deu chia het cho 3 va 5 , tu do tim gtnn cua A
tim gia tri nguyen cua x de bieu thuc:x^2+7/x+1 cung nhan gia tri la so nguyen
so nguyen a de 3/7-3a la so tu nhien a la
Tim n de bieu thuc sau la so nguyen : P = \(\dfrac{3n+2}{n-1}\)
Tim gia tri nho nhat cua bieu thuc A = \(|2x-2|\) + \(|2x-2013|\) voi x la so nguyen !?!?
Cho don thuc A= -xy2 , B=5xy3z, C=5xy2
a, Tim cac so nguyen x de bieu thuc M= \(\dfrac{3}{7-x}\) dat gia tri lon nhat
so nguyen a de \(\frac{3}{7-3a}\)lá số tự nhiên a là
