n2 + 5n + 1 = n ( n + 5 ) + 1
Với n \(\\ \in \) N thì n + 5 > 1
=> n2 + 5n + 1 thì n = 1
thử từng trường hợp 1,2,3 , 3k,3k+1,3k+2
tim so nguyen duong n nho nhat sao cho n/2 la binh phuong cua mot so nguyen va n/5 la lap phuong cua 1 so nguyen
Bai1 a,cho n thuoc N. Chung minh rang 6n+5 va 4n+3 la 2 so nguyen to cung nhau
b, tim so nguyen x sao cho x+2016 la so nguyen duong nho nhat
tim so so nguyen n nho nhat sao cho n^2+5^n+1 la so nguyen to.
tra loi n=?
tim so tu nhien n nho nhat sao cho n+2,n+6 la so nguyen to
tim so tu nhien n nho nhat sao cho n ; n+2 ; n+6 la cac so nguyen to
tim cac so nguyen duong n sao cho n^2/60-n la 1 so nguyen to
tim số nguyen duong nho nhat thoa man mot phan 2 so do la so chinh phuong,mot phan 3 so do la luy thua bac 3 cua 1 so nguyen, mot phan 5 so do la luy thua bac 5 cua 1 so nguyen
bai 1
a, chung to rang 2n+5/n+3, ( n thuoc N ) la phan so toi gian
b, tim gia tri nguyen cua n de B= 2n+5/n+3 co gia tri la so nguyen
bai 2
tim so tu nhien nho nhat sao khi chia cho 3 du 1 cho 4 du 2 cho 5 du 3 cho 6 du 4 va chia het cho 11
Tim so nguyen duong nho nhat thoa man:mot phan 2 cua no la so ching phuong,1/3 cua no bang lap phuong cua 1 so nguyen,1/5 cua no bang luy thua bac 5 cua 1 so nguyen.
