uses crt;var x,y:real;beginclrscr;writeln('x=');read(x);if (x<>4) and (57-0.3*x*x*x>0) thenbeginy:=x*x-((sqrt(57-0.3*x*x*x)))/(x-4);writeln;write('y=',y);endelse writeln('error');end.
uses crt;
var x,y:real;
begin
clrscr;
writeln('x=');
read(x);
if (x<>4) and (57-0.3*x*x*x>0) then
begin
y:=x*x-((sqrt(57-0.3*x*x*x)))/(x-4);
writeln;
write('y=',y);
end
else writeln('error');
end.