p(x)=ax^3+bx^3+cx+d co gia tri nguyen voi moi x nguyen khi va chi khi 6a,2b,a+b+c va d la so nguyen
Cho f(x)=ax3+bx2+cx+d. CMR neu 6a, 2b, a+b+c va d la cac so nguyen to thi f(x) co gia tri nguyen voi moi so nguyen x
Cho f(x)=ax^2+bx+c. Biet f(0), f(1), f(2) la so nguyen. Chung minh f(x) luon nhan gia tri nguyen voi moi x nguyen
Cho y=f(x)=ax^3+bx^2+cx+d. Biet hamso nhan gia tri nguyen voi moi x nguyen. CM 6a, 2b, a+b+c la cac so nguyen.
CM dieu nguoc lai.
Cho f(x)=ax^2+bx+c . CMR: ko co nhung so nguyen a,b,c nao lam cho f(x)=1 khi x=1998 va f(x)=2 khi x=2000
cho da thuc q(x)=ax^2 +bx +c .biet Q(1),Q(-1),Q(0) la so nguyen.cmr voi moi x nguyen thi Q(x) nguyen
2 da thuc ax^2+bx+c va ax'^2+bx'+c bang nhau voi moi x chung minh rang a=a' b=b' c=c'
cho da thuc f(x)=ax^2+bx+c voi a,b,c la cac so thuc . Biet rang f(0), f(1), f(2) co gia tri nguyen . cmr : 2a, 2b cung co gt nguyen
chof(x)=ax^2+bx+cvoi a b c là các số hữu tỉ thỏa mãn 13a+b+2c=0 cmr f(-2)xf(3),nho hon bang 0
cho f(x) = ax3 + bx2+c+d (a,b,c,d thuoc z) va thoa man b= 3ac
cmr: f(1) , f(-2) la binh phuong mot so nguyen
