tim 2 so nguyen to ma tong va hieu cua 2 so la so nguyen to
nay the o do la may –  tieubacbac123 16-10-13 07:04 PM
lam giup tui voi –  tieubacbac123 16-10-13 11:23 AM
tìm 2 số hay 1 số –  Dép Lê Con Nhà Quê 16-10-13 11:21 AM

Cần trả +1,000vỏ sò để xem nội dung lời giải này

Ta có $a+b=c-d = p $ với $a;\ b;\ c;\ d;\ p$ là các số nguyên tố

$p = a+b$ là nguyên tố $\Rightarrow p > 2$ và $p$ lẻ

$p =c-d$ mà $p$ lẻ nên $c;\ d$ có 1 số là $2$ mà $c>d \Rightarrow d=2$

$p$ lẻ nên 1 trong $a;\ b$ phải chẵn $=2$ mà $a>b \Rightarrow b=2$

Ta có $p = a +2 = c-2$

$\Rightarrow a+2 = p;\ p+2 = d \Rightarrow a;\ p;\ d$ là 3 số lẻ liên tiếp

chỉ có bộ $(a;\ p;\ d) = (3;\ 5;\ 7)$ thỏa mãn




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