Question

sa se afle numarul xyz,stiindca xyz=xy+yz+zx

Answer 1

xy + yz + zx = 66
10x + y + 10y + z + 10z + x = 66
11x + 11y + 11z = 66
11 ( x + y + z ) = 66
x + y + z = 66 : 11 = 6
Nr sunt : 150 , 105 , 114 , 141 , 411 , 321 , 312 , 213 , 231 , 132 , 123 

Answer 2

 xy +
 yz
 zx
xyz

x + y $\geq$10
x = 1, y = 9, z = 8
 19 +
 9z
 81
198