Câu 1:
uses crt;
var i,m,n,t:longint;
begin
clrscr;
write('Nhap m,n: ');readln(m,n);
for i:=m to n do
if i mod 2=0 then inc(t,i);
writeln('Tong cac so chan tu m den n: ',t);
readln
end.
Câu 2:
uses crt;
var i,n:longint; s:real;
begin
clrscr;
write('Nhap n: ');readln(n);
for i:=3 to 3*n do
s:=s+1/i;
s:=s+500;
writeln('S= ',s);
readln
end.