Bài 1:

program in_phan_tu;

uses crt;

var n,i:longint;

a:array[1..100] of longint;

begin

clrscr;

write('nhap so n:');readln(n);

for i:=1 to n do

begin

write('nhap phan tu a[',i,']:');readln(a[i]);

end;

for i:=1 to n do

write(a[i]:3);

readln;

end.

Bài 2:

program tong_phan_tu;

uses crt;

var n,i,tong:longint;

a:array[1..100] of longint;

begin

clrscr;

write('nhap so n:');readln(n);

for i:=1 to n do

begin

write('nhap phan tu a[',i,']:');readln(a[i]);

end;

tong:=0;

for i:=1 to n do

tong:=tong+a[i];

writeln('tong cua day la:');

readln;

end.

Bài 3:

program tong_phan_tu_chan;

uses crt;

var n,i,tong:longint;

a:array[1..100] of longint;

begin

clrscr;

write('nhap so n:');readln(n);

for i:=1 to n do

begin

write('nhap phan tu a[',i,']:');readln(a[i]);

end;

tong:=0;

for i:=1 to n do

if a[i] mod 2=0 then tong:=tong+a[i];

writeln('tong cua day la:');

readln;

end.

Câu 1: 

uses crt;

var a:array[1..100]of integer;

i,n:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

for i:=1 to n do 

  write(a[i]:4);

readln;

end.

Câu 2: 

uses crt;

var a:array[1..100]of integer;

i,n,t:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

t:=0;

for i:=1 to n do 

 t:=t+a[i];

writeln(t);

readln;

end.

Tham khảo

uses crt;

var a:array[1..100]of integer;

i,n,dem,t:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

 begin

write('A[',i,']='); readln(a[i]);

end;

dem:=0;

t:=0;

for i:=1 to n do 

  if (10<a[i]) and (a[i]<20) then 

begin

inc(dem);

t:=t+a[i];

end;

writeln('So phan tu lon hon 10 va nho hon 20 la: ',dem);

writeln('Tong cac phan tu lon hon 10 va nho hon 20 la: ',t);

readln;

end.

4:

#include <bits/stdc++.h>

using namespace std;

long long n,i,dem,x;

int main()

{

cin>>n;

dem=0;

for (i=1; i<=n; i++)

{

cin>>x;

if (x<10) dem++;
}

cout<<dem;

return 0;

}

Var i,n,dem:integer;

so:real;

Begin

Write('Nhap so luong so = ');readln(n);

For i:=1 to n do

Begin

Write('Nhap so thu ',i);readln(so);

If so < 10 then dem:=dem+1;

End;

Write('Co ',dem,' so be hon 10');

Readln;

End.

uses crt;

var s:string;

ktu:char;

i,d,dem:integer;

begin

clrscr;

write('Nhap xau:'); readln(s);

write('Nhap ki tu:'); readln(ktu);

d:=length(s);

dem:=0;

for i:=1 to d do 

  if s[i]=ktu then inc(dem);

writeln('So ki tu ',ktu,' trong xau ',s,' la: ',dem);

for i:=1 to d do 

 if s[i]=ktu then delete(s,i,1);

writeln('Xau sau khi xoa cac ki tu ',ktu,' la: ',s);

readln;

end.

uses crt;

var a:array[1..100]of integer;

i,n,dem,t:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

  begin

       write('A[',i,']='); readln(a[i]);

  end;

writeln('Cac so chan la: ');

dem:=0;

t:=0;

for i:=1 to n do 

  if a[i] mod 2=0 then

   begin

write(a[i]:4);

t:=t+a[i];

inc(dem);

end; 

writeln('Tong cac so chan la: ',t);

writeln('Trong day co ',dem,' so chan');

readln;

end.

Câu 1: 

#include <bits/stdc++.h>

using namespace std;

long long i,n,k,dem,x;

int main()

{

cin>>n;

cin>>k;

dem=0;

for (i=1; i<=n; i++)

{

cin>>x;

if (x==k) dem++;

}

cout<<dem;

return 0;

}

bạn hỏi khó thế, đây mới là phần cho lớp 8 thôi mà