Các câu hỏi tương tự
tim so nguyen n de gtri bieu thuc sau la so nguyen to: 3n3-5n2+3n-5
tim cac so tu nhien n de gia trị bieu thuc sau la so nguyen to : 5n^3-9n^2+15n-27=0
tim n de n+1;4n^2+8n+5 va 6n^2+12n+7 cung la so nguyen to
cho bieu thuc P=a/a^2-a+1 tim a la so tu nhien de bieu thuc P co gia tri nguyen
CMR:
a,Bieu thuc : n(2n-3)-2n(n+1) luon chia het cho 5 voi moi n la so nguyen
b,Bieu thuc (n-1 )(n+4) - (n-4) (n+1)
chung minh gia tri cua bieu thuc n(n+5)-n(n-3)(n+2) luon chia het cho 6 voi n la moi so nguyen
tim n de bieu thuc sau la so chph:
a)n3-n+2
b)n4-n+2
tim gia tri x nguyen de bieu thuc (3x2-4x+x-1)/(3x+2) co gia tri nguyen
tim gia tri x nguyen de bieu thuc (3x3-4x2+x+1)/(x-4) co gia tri nguyen
cho phan thuc 2n2-5n+3/2n+5
tim n de x nguyen