Ta co 601 la so le nen se bang tong cua 1 so chan va 1 so le.
Ma so nguyen to chan duy nhat la so 2 .
Suy ra 1 trong 2 so la so 2.
So con lai la:
601 -2 = 599 ( la so nguyen to)
Vay 2 so can tim la 2 va 599.
tim 2 so nguyen to biet tong bang 601
Tim hai so nguyen to biet tong cua chung la 601
tim 2 so nguyen to biet tong cua chung bang 2005
a, Chung minh rang 5m+3 va 3m+2 la 2 so nguyen biet rang 1 so bang 10 ngen to cung nhau voi m la so nguyen to bat ky.
b,Tim 1 bo ba so nguyen to biet rang 1 so bang 10 phan tram tong cua 3 so can tim
Ai lam nhanh nhat minh tick cho
tim so nguyen to biet rang so do bang tong 2 so nguyen to va bang hieu 2 so nguyen to
tim 2 so nguyen to p,q biet :
a/hieu cua chung bang 35
b/tong cua chung bang 63
p;p+6;p+8;p+12;p+14 deu la so nguyen to
tim so nguyen to biet rang so do bang tong cua 2 so nguyen to va bang hieu cua 2 so nguyen to
Tim hai so nguyen biet
Tich cua chung bang 4747va tong cua chung bang -148
Tim 3 so nguyen duong biet tong cua chung bang nua tich chung