Program Kvadrat;
var
a, b, c, x1, x2, d: real;
BEGIN
write('Vvedite a,b,c: ');
readln(a, b, c);
d := (b * b) - (4 * a * c);
if d < 0 then
writeln('NET reshenii');
if d = 0 then
begin
x1 := -b / (2 * a);
writeln('x= ', x1:0:2);
end;
if d > 0 then
begin
x1 := (-b + sqrt(d)) / (2 * a);
x2 := (-b - sqrt(d)) / (2 * a);
writeln('x1= ', x1:0:2, '; x2= ', x2:0:2);
end;
readln;
END.