uses crt;
var y,a,b,h,sr:real;
k:longint;
begin
clrscr;
a:=-3;
b:=5;
h:=0.01;
sr:=0;
while a<b+h do
begin
y:=2-a*a+3*a;
if y<0 then
begin
k:=k+1;
sr:=sr+y;
end;
a:=a+h;
end;
write('sred=',sr/k:0:2);
readln
end.
uses crt;
var y,a,b,h,sr:real;
k:longint;
begin
clrscr;
a:=-3;
b:=5;
h:=0.01;
sr:=0;
while a<b+h do
begin
y:=2-a*a+3*a;
if y<0 then
begin
k:=k+1;
sr:=sr+y;
end;
a:=a+h;
end;
write('sred=',sr/k:0:2);
readln
end.