có 73 là nguyên tố
còn lại ko phải nhe
đúng k cho mình xin
so 1431 la so nguyen to,cac so con lai la so hop so
tong tat ca cac so nguyen to co dang 13a(chu y so tren la so co dang 13a chu khong phai 13 nhan a)
phan tich cac so sau ra thua so nguyen to , tu do cho bet cac uoc la so nguyen to , cac uoc so la hop so , so do co bao nhieu uoc ?
cac ban giai nhanh len tui can gap ?
thay dau x boi cac so thich hop de cac so sau day la cac so nguyen to 12x ; 36x
11111 co phai la so nguyen to khong .neu la hop so thi hay phan tich ra thua so nguyen to
1so nguyen to chia cho 30 co so du la r tỉm r biet r ko phai la so nguyen to
tim cac so nguyen to x va y sao cho cac so 5x+y va xy+13 cung la so nguyen to
giai nhanh giup minh nha mai minh phai nop roi
Không tính gia tri cho biet cac bthuc sau co phai la so nguyen to khong?giai thich cach lam
A=4.5.6+15.17
B=11.13.15-2.39.5
C=11.13.17+121+33
D=17.19.23+23.25.27
