#TK
uses crt;
var s,i:integer;
begin
clrscr;
s:=0;
for i:=3 to 97 do
s:=s+i;
write(s);
readln;
end.
uses crt;
var s,i:integer;
begin
clrscr;
s:=0;
for i:=3 to 97 do
s:=s+i;
writeln(s);
readln;
end.
b1;tim ssh cua day so cach deu tren cong thuc lop 5:(97-3):khoang canh +1; :))
b2;tinh tong bang cong thuc lop 5 sau : tong=(so dau + so cuoi)*ssh/2;
b3; xuat ra :)))