1)
program ct;
uses crt;
var i,n:integer;
S:longint;
begin clrscr;
write('Nhap so n: '); readln(n);
S:=0;
for i:=1 to n do
if i mod 2=1 then S:=S+i;
write('Tong ca phan tu le la: ',S);
readln;
end.
2)
program ct;
uses crt;
var i,n,d:integer;
S:longint;
begin clrscr;
write('Nhap so n: '); readln(n);
write('Cac so tu 1 -> ',n,' la: ');
for i:=1 to n do
begin
write(i:3);
inc(d);
end;
writeln('Co ',d,' so tu 1 -> ',n,');
readln;
end.
3)
program ct;
uses crt;
var A:array[1..1000] of integer;
i,n:integer;
begin clrscr;
write('Nhap so phan tu: '); readln(n);
for i:=1 to n do
begin
write('Nhap phan tu thu ',i,': '); readln(A[i]);
end;
write('Cac phan tu duong la: ');
for i:=1 to n do
if A[i]>0 then write(A[i]:3);
readln;
end.
4)
program ct;
uses crt;
var i,n,d:integer;
S:longint;
begin clrscr;
write('Nhap so n: '); readln(n);
S:=0;
for i:=1 to n do
begin
inc(d);
S:=S+4*i;
end;
write('Co ',d,' so la boi cua 4');
writeln('Tong chung la: ',S);
readln;
end.
Học tốt!
