a ; b = a + 2 ; c = b + 2 = a + 2 + 2; d = c + 2 =b + 4 = a + 2 + 2 + 2
a + (a + 2) + (a + 2 + 2) + (a + 2 + 2 + 2) = 1800
4a + 12 = 1800
4a = 1800-12
a = 447
a=447 ; b = a+2=447+2=449 ; c =449 +2 = 451; d =c+2 =b+4 =447+2+2+2=453
deci cele 4 numere sunt a = 447, b = 449 , c=451 si d= 453
