Với \(p>3\) nữa nha bạn.
Ta có:
\(8p-1;8p;8p+1\) là 3 số tự nhiên liên tiếp nên một trong 3 số phải chia hết cho 3.
Mà \(8p-1;8p\) không chia hết cho 3 nên \(8p+1⋮3\)
\(\Rightarrowđpcm\)
cho p va 8p-1la so nguyen to . chung minh 8n+1 la hop so
cho p va p+8 la so nguyen to(p>3).chung minh rang:8p-1 la hop so
cho so nguyen to p va mot trong hai s 8p+1 va 8p-1 la so nguyen to ,so con lai la so nguyen to hay hop so?
Cho P va 8P-1 la so nguyen to (p>3)
Hoi 8P+1 la so nguyen to hay hop so.
cho p la so nguyen to lon hon 3
a] chung to rang p 6k+1 hoac 6k+5
b] biet 8p +1 la so nguyen to chung minh 4p+1 la hop so
bai 3 cho p la so nguyen to lon hon 3
A, chung to p co dang 6k+1 hoac 6k+5
B, cho p va 8p-1 la so nguyen to. chung to 8p+1 la hop so
bai 4
A, tim a va b biet rang a.b=320 va BCNN(a,b)=160
B, tim so tu nhien a nho nhat co 3 chu so sao cho khi chia a cho 11 du 5 va chia cho 13 thi du 8
cho p la so nguyen to lon hon 3. Biet 8p+1 va p deu la so nguyen to (p lon hon 3).Hoi p+100 la so nguyen to hay hop so
CMR:neu 8p-1va pla so nguyen to thi 8p+1 la hop so
cho pva 8p➕1 la cac so nguyen to.
hoi8p➖1 la so nguyen to hay hop so