Answer :

crisforp
y^z = ( - 1 )^2 = + 1;
z / y = 2 / ( - 1 ) = -2;
xyz = 5 * ( -  1 ) * 2 = - 10 ;
 y^z-z/y+xyz = 1 - 2 - 10 = - 11;
  y^z-z/y+xyz divided by xyz <=> ( - 11 ) divided by ( - 10 ) = 1.1;